Here is a more detailed account, in any case:
Once St. Therese had a confrontation regarding this topic with Sr. Marie Febronia, who not only was sixty-seven years old but also was sub-prioress. She had heard that St. Therese encouraged the novices to believe that they could go straight to heaven. She did not like this as she considered this kind of confidence presumptuous, and thus she reproached St Therese. St Therese tried lovingly and calmly to explain to Sr. Febronia her point of view but with no success as Sr. Febronia clung to belief. For St. Therese God was more Father than Judge, and she took the liberty of finally responding, “My sister, if you look for the justice of God you will get it. The soul will receive from God exactly what she desires.”
The year had not passed when, in January 1892, Sr. M. Febronia together with other sisters fell prey to the flu and died. Three months later Sr. Therese had a dream which she related to her Mother Prioress and which was then documented: “O my Mother, my Sr. M Febronia came to me last night and asked that we should pray for her. She is in Purgatory, surely because she had trusted too little in the mercy of the good Lord. Through her imploring behavior and her profound looks, it seemed she wanted to say, You were right. I am now delivered up to the full justice of God but it is my fault. If I had listened to you I would not be here now.”12
(I still did not locate the direct reference yet, however. Perhaps a bit OCD of me. I’ll look for it later.)