AITA Its my Birthday and she Hates Me

AITA

My MIL is hosting a birthday dinner for myself and 2 of my sisters as our birthdays are all in December. The problem is she's also inviting a woman she "took in" who literally hates my guts and spends her days talking shit about me and my 18 month old daughter. AITA if I bail on my own dinner party?

PS it's literally ON my birthday.