Please screen shot the exact dialogue you mean. From what I remember, she gets out on her own if playing solo.
Both pics are from the solo run, this one is the one that comes first:
And this one is the one that is right after (I also noticed a spelling error as well, "hrt" should be "her"):
If I recall, this was said on the Weight Gaming fourms:
There is an alternative ending to the scene. It’s very short and is a gameover involving Issy keeping Mari there indefinitely.
It can be activated on a vore run or solo run.