I absolutely adore her so much. I love that she’s full of confidence in her abilities and is actively fucking with the bad guy.
I mean as far as she knows, the robed guy is presumably human and she was able to easily 'overpower' Will in the human body , idk if slime possession strengthens you (not that Lady Jelly was weak, given the taste for torturing ppl), but it is interesting in contrast to the "weakest demon" that the summary describes slimes as, and 'easily defeated by human adventurers' in slime form or so, because i imagine that most slimes wouldn't go out and be confrontational with other creatures