This is inaccurate advice, which could add unnecessary guilt to the OP and others with similar concerns.
I think the poster you’re responding to has made a very clear statement on what the norm is in this type of situation.
Yes, there can be exceptions in terms of culpability.
But I’m very, very nervous that folks put far too much emphasis on mitigating factors and not enough on admitting their responsibility.
I think it is fair to say that the Church does not have incredibly precise statements on what full knowledge and full consent actually mean. But it does seem to be generally assumed that one can mortally sin when one has the capacity to make a sufficiently free human act.
The OP makes it clear that they understand that not going to Holy Mass on Sunday is grave matter. I’m sure she made the choice to not go, but I’m not sure it was for a reason she thinks excuses her.
Her question is therefore whether committing a mortal sin implies one should not receive Holy Communion if one has made an Act of Perfect Contriton but has not gone to Confession.
The answer is that yes, not receiving Holy Communion is precisely what is envisioned in that situation. I don’t think it’s helpful to pull out the culpability card here, or to insinuate someone might have no subjective guilt when they’ve committed an objective mortal sin. To even consider that possibility with a stranger over the internet is in no way a service to them, especially when they may not be particularly well formed.
I know that CAF is very fond of telling everyone to go see their priest and ask them whatever question of moral theology they might have.
I agree.
Let’s also encourage them to do so in Confession.