Thanks for the encouragement! I was able to nurse upright twice yesterday, just by putting her body in position and rocking her, then let her find the nipple on her own after crying abated. She pulled off a few times, then latched herself again. I think I had started to force her to latch, and she needs to feel free to pull away if the letdown is too forceful. Two times is twice more than we've managed in weeks.
Family reunion this weekend. I'm bringing a quilt to lie on, if necessary. Good thing I have a huge, boisterous and supportive family!