I think it's wonderful. Just the words you wrote "pregnancy test stick in her shaking hand, tears running down her cheeks, and asked "Am I reading this right?" is wonderful. Your daughter came running to you and that shows such a wonderful blessing!!
Congratulations Tink to both you and your daughter.

Everything happens for a reason and she shared with you a moment in her life that both of you will remember forever. She's gonna be a Mommy and you are going to fall in love with a grandbaby. Doesn't get much better than that! All that other stuff will fall into place, no worries.