NEED ADVICE !!! Opinions please

I need some advice ladies . My sister in law unfortunately is an addict . She is addicted to speed and recently we believe she has started doing something harder as her teeth are deteriorating and she constantly has sores on her face . She lost her son a couple months ago for the second time due to neglect and an unsafe environment. Her animals are abused , she had a dog put down as she starved him and then my ML bought him dog food and while regaining his strength became , I don't want to say vicious but nasty towards her (obviously) After the dog was put down she got a new puppy , which had now been given to a shelter because she was losing chunks of hair (she asked someone to shoot the puppy first) She refuses to take any owner ship and is blaming everyone else . She refuses to believe she doesn't have a problem and it's everyone else who is delusional. My mother in law and especially father in law turn a blind eye and ignore her issues.

My husband and I do not have a relationship with her as we don't support her life choices or agree with how she mistreats people and animals and herself . We know she will use us , and lie to us as she has in the past and have made it very clear that unless she needs help getting sober she is not welcome in our lives . We have offered to pay for her treatment and hope that she decides to take it very soon .

My husband and I are in our second trimester and his Mom recently brought up his sister .... seeing and being involved with the baby . Personally I don't want her in our babies life . When we got home my husband said he just wants to make his family happy and let her meet the baby . I've never seen my sister in law sober. I don't want to cause any tension but at the same time I don't want to have to explain to out child who this shady person is they only see a couple times a year is . I'd almost rather explain to a child why Matante wasn't in their life then explain to a toddler why Matante looks like that , smells like that , why she walks like that .

I want her in our lives , but I want her healthy and sober in our lives .

Am I wrong ? How should I handle this ? Is it worth the fight ?