Emotional Inc*st ?

I came across a photo from a little over year ago, it was a wedding guestbook signed “Jane & John Doe” (mil and husbands name) my husband and I have been together for 6 years married for 4. I’ve always had this feeling mil had this competitiveness with her spot in husbands life because of the way she’s treated me, and I feel like this confirmed it. Also to mention she wanted him to help her pay HER monthly bills and got upset, when I told my husband I don’t agree she said “you said you’d help me if I ever needed it she’s messing up what we got going on… I’m trying to help you guys learn how to manage your bills” we’ve lived on our own for 5 years and never asked her or anyone for help paying our bills 😅 Am I overreacting? She’s 40 and you can tell she’s a woman who desperately wants to be loved and taken care of by a man, but I feel like until then she expects my husband to fill some sort of void for her and tries to ignore that he’s literally married with his own family. She’s also recently expressed to a family member that she does feel in competition with me which sealed the deal. What would you define emotional inc*st vs bitter mil?