MizTink--I didn't see your thread until it was bumped, but I must say that I give you kudo's for how you handled the situation.
None of us parents ever wants to be caught in that position--and shame and hiding doesn't fix the problem. I am shocked by how she was treated by her own parents and at what they seemed to have attempted to do.
I am not sure if I was 17 and in labor that I would have known what to do. My mom was 18 when she had me (disclaimer: Though she was a teen mom, I was but a sparkle when they got married and wasn't born until 11 months later.). At 18, when she went into labor, her water broke and to say she was clueless was an understatement.
In any case--I'm impressed that she did leave her family and likely ended up with a delivery she wanted with loving people instead of controlling people.
While I hope to never find myself in such a position--I do pray that if something like that were to happen, that I can be as loving and accepting as you have been. You give Grandma's a good name! Good job and congratulations on the new baby.
(And if any of this sounds bad, it isn't meant to be--I'm just very impressed with your demeanor in handling the news, your son, and the gf and your new grandchild. My cousin was a teen mom and the ummm...meanness that her mother exhibited to her was quite callous. Especially during labor.

They are on very good terms right now which amazes me given her upbringing especially in her teenage years.

)