I suppose the obvious thing would be to support her in whatever way you can, until she can get to a place with enough stability, and agency, to face life independently.
Do your best not to judge her. Be patient. Give her space. Listen to her if she wants to share, but don’t push. All you can do is to provide her with a safe and supportive space, where she can heal and do what she needs to do to get back on her feet.
Life can be tough, and throw some unexpected curve balls at us. Those of us who have loving and supportive families, have a much better chance of managing it.
She’s reaching out to you. Parenting doesn’t have an expiration date. Neither does family. I wish you all the best.