I would adopt an attitude of holy indifference and report this to my confessor or spiritual director

Remember that it is not so much whether or not we belong to the Catholic Church, but whether or not we love God with all our hearts and our neighbor like ourselves. Besides, Presbyterian Baptism is - as far as I know - a valid baptism that incorporates the faithful into the Church, which is the mystical body of Christ, though not in full communion with the Catholic Church.
If you, who saw her only a limited amount of times and had imperfect knowledge of her, could see that she was an amazing woman, imagine how much more does Christ know this, He who loves to dwell in the heart of the rightful
I’d pray for her soul (in case she is in Purgatory) and for her intercession (in case she already made it to Heaven

).
RC gives great advice here, and advice in line with the Teachings of the Catholic Church according to VC II. The Council teaches that those Christians & indeed all peoples, who love God but through no fault of their own are not Catholics are our brother and sister Catholics by desire and may gain Salvation.
Code:
It seems that this may have been an apparition of the Devil. They have no consistent form and can appear as anything; but something should have alerted the OP in the form. It was there to get you to engage in a two-way conversation. If it were an angel he would have alerted you and identified himself.
It used the controversy or worry about this poor woman as an opportunity to promote despair and to attempt you to engage in a two-way conversation using the despair or worry about this women who died. That is the wound on the Soul. This is where the OP needs to direct their prayers to faith, trust, and charity in Jesus Christ.
No Holy Angel would deliver such a message that assails the spirit or brings worry or despair. Not on this particular issue: Judgement. We are supposed to pray for our loved ones who have died.
Vatican Council II addressed issue of Salvation of Non-Catholics in the “Dogmatic Constitution on the Church (Lumen Gentium),” “Those who, through no fault of their own, do not know the Gospel of Christ or His Church, but who nevertheless seek God with a sincere heart, and, moved by grace, try in their actions to do His will as they know it through the dictates of their conscience – those too may achieve eternal salvation” (no. 16). In short, those who are truly unaware of what God requires of them are not held responsible; rather they are judged by what they did with the truth they had.
This is teaching reflects St Paul’s Epistle to the Corinthians:
“Therefore do not pronounce judgment before the time, before the Lord comes, who will bring to light the things now hidden in darkness and will disclose the purposes of the heart. Then every man will receive his commendation from God” (1 Corinthians 4:5).
This teaching is again reflects Romans 2:13-16:
He expands on this in Romans 2:13-16, “For it is not the hearers of the Law who are righteous before God, but the doers of the Law who will be justified. When Gentiles who have not the Law do by nature what the Law requires, they are a law to themselves, even though they do not have the Law. They show that what the Law requires is written on their hearts, while their conscience also bears witness and their conflicting thoughts accuse or perhaps excuse them on that day when, according to my gospel, God judges the secrets of men by Christ Jesus.”
This is again restated in VC II: “Decree on the Church’s Missionary Activity (Ad Gentes Divinitus),” “Hence, those cannot be saved, who knowing that the Catholic Church was founded through Jesus Christ, by God, as something necessary, still refuse to enter it or remain in it” (no. 7).
Back in the 1800’s the encyclical “On Promotion of False Doctrines (Quanto Conficiamur Moerore)” by Pope Pius IX by stated:
Code:
" We all know that those who suffer from invincible ignorance with regard to our holy religion, if they carefully keep the precepts of the natural law which have been written by God in the hearts of all men, if they are prepared to obey God, and if they lead a virtuous and dutiful life, can, by the power of divine light and grace, attain eternal life. For God, who knows completely the minds and souls, the thoughts and habits of all men, will not permit, in accord with His infinite goodness and mercy, anyone who is not guilty of a voluntary fault to suffer eternal punishment (no. 7)."
Finally, Fr. Leonard Feeney dissented against this teaching of the Church received a letter from the Holy See that stated:
“
But this dogma [No Salvation outside the Church] is to be understood as the Church itself understands it. For our Savior did not leave it to private judgment to explain what is contained in the deposit of faith, but to the doctrinal authority of the Church.”
BP