At my wit's end

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I do not see her moving. She very dependent on her STBXH and parents...financially and in every other way. She suffers from some emotional and psychological problems as well as the fact she's a heavy drinker. She has a great family, such sweet kids. I don't see her ever stopping her pursuit of my husband, as she is looking for a meal ticket. I do not put all blame on her; in fact, I hold my husband completely responsible for his poor choices, but she's not right in the head, so to speak.
I saw her today, and it takes every bit of strength and class I have to just look and walk away. He sent me a text after I saw her (I had told him how it upset me), and he said "Let's just live our life, ignoring her existence, and enjoy our wonderful children and each other." I pray he has the strength to follow through with this.
Sorry if there are typos...I'm poolside with the kiddos on my phone!