I can understand why you're feeling concerned. That does sound really challenging, and it must be hard to watch things unfold like that. I'm slightly confused about an aspect of your post and just wanted some clarification from you. You said that " She has her boyfriend here and she's aggressive verbally and can't get her head around being dumped" - are you talking about our grandchild or your child here?
I'm really sorry you're going through this. It sounds like you're a wonderful grandmother and I'm sure your granddaughter really appreciates you.
I'm not sure if you're from Australia, but if you are, it might be worth calling the helpline "ParentLine" for some support on the issue...They offer free and confidential counselling and support to parents and carers on any parenting issues they may be facing. The number for ParentLine differs per state. Scroll to the bottom of this page to see which number to call if you're interested. If you're not based in Australia, then it might be worth googling if there's something similar in your country.
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