When my niece (19 at the time) told us she was pregnant my husband and I were both speechless. Her mother was devastated b/c she had her first at the same age and knew what was coming. Honestly, it took a good month for us to take a breath and feel genuinely supportive.
I remember my SIL coming to our house sobbing b/c she was in the same spot- didn't want to enable her, but wanted to support her wherever needed. Honestly, she gives her far more support (time and $$) then she gives her other daughter, but my other niece doesn't need the support.
I wish there was a "right answer" for you and normally I would have some kind of "pshrinky" answer, but in all reality this is one of those times you just do what feels right for both of you.
Just a few lessons we've learned through the "ups-and-downs" with my in-laws...
- Don't loan money to family. If you give them money, just give it with no expectation of it being returned and no obligation or guilt.
- Offer to help ONLY when you can... if it inconveniences you significantly then don't offer. There's nothing worse than saying "yes" when you really mean "no" and then holding a grudge. If you can, great. If you can't, say so.
- They may not accept $$ from you, but they won't turn down a casserole or a few "essentials" you picked up at the grocery store on your way over.
- Just listen. Advice isn't generall what a person is looking for... ususally just someone to listen and be quiet and then say "I'm sorry you're feeling_________. I love you"
Good luck and enjoy this time with your daughter.