Need to vent *vaccines*

Hope this doesn’t get confusing I just really need to vent and get some honest feedback....

first off my 17 month old Guide Daughter is my life, she lives with me, I’ve been taking care of her since she was 2 months old. Her mom is in and out and on drugs and dad isn’t in picture anymore although he is the one that started this anti-vaxx nonsense (and it turns out he isn’t the real dad) anyways she refuses to vaccinate and I’m 6 months pregnant. I dont know what to do, I don’t have any legal rights to her. I’m going to be absolutely devastated if I can’t get her mom to agree to vaccinations before my baby is born in May. I don’t know if she is just lazy and in her addiction and won’t take her or if she really is going to stay anti-vaxx

Anyone have anything similar or any advice? Not really looking for a debate. (I am pro vaccinations/ pro science all the way)