I think Summer Rose is gorgeous. It goes beautifully with Oliver & Gracie too, BUT, I think 'Summer Jenner' sounds a bit funny IMO.

Out of your list my fave is Amelia, it goes really well with Jenner and Oliver & Gracie! Like sneakysparkle said, I wouldn't be worried about your mothersgroup friend.

Sophia is my second fave.

Good luck deciding.... its so hard isn't it!!