Hey Tegan's Mum,
I'm jumping in here from a completely different perspective.
My best friend has SB. She can't walk, but crawls fine and at her Mum's house I used to wheelbarrow her up the stairs all the time (not that she couldn't get up on her own, but together was faster and more fun). As teens we used all the concessions we could get - cinema, concerts, and later the best parking spots. Ok, I'd drive and she'd get so drunk she'd fall out of her wheelchair and I had to smuggle her home without her Mum noticing, but hey
I used to be way more worried than she was that people would fall over her on the dancefloor and other crowded areas. Sure it happened, but she was fine and she certainly pays anyone lipservice who tries to mess with her.
I tell you, she's totally ace! She's beautiful, intelligent, and I'm looking forward to being her bridesmaid very soon! Especially, since she was mine last Summer
You have so much to look forward to with Tegan. Yes, things will be hard (and I don't envy you your slipped discs carrying her around), but I'm sure with her lovely Mummies Tegan will have a great and fun life!