My stepson's mom

My husband's ex wife has drug him through court for 3 yrs and still hasn't gotten anything accomplished.in fact it just seems that she is prolonging this so we might give up- not gonna happen. All we've done so far is pay over 5k to our lawyer. She is on her 4th lawyer and I swear she has mental issues, but my confession is that I enjoy being the one with her ex, raising her child. She is a horrible heartless person and to make it worse it is never about my stepson it's always about her. So I go out of my way to volunteer with the school so that people won't believe her lies. I started a journal about everything she does and says to my stepson or husband or me. From the beginning of the school year I've written 13 pages. Well I know how much she can't stand me bc I'm not the biological mother.There is a school fieldtrip coming up and I refuse to let her keep me from going ( plus the school prefers me to her).
I'm guilty of nothing more than being a mommie replacement. I just needed to vent. Thanks