Hi, OP here, I thought I would update on how my daughter is doing.
She's 8 months now (actual) and just started rolling on her strong side, which is great. Her head control is pretty darn good, too.
We saw her pediatrician recently and she was concerned that her development is farther behind than it was... DD is not doing the things a 6 month old would be doing (she's about 6.5 months adjusted) and she is falling more and more behind on those milestones. This really isn't worrying us, because she is progressing. For example, she tolerates being in a bumbo chair now, whereas a couple months ago you couldn't get her folded enough to put her in the chair (tone issues). She looks like a big 3 month old. (When strangers guess her age, they always guess 3 months. I tell them "8 months" without explanation at this point.)
We also went in for a followup for her inward turned eye, which the ophtho found to be more marked than before. She additionally has nystagmus now. It's so funny that we can't see these things ourselves. I actually never notice it anymore, she looks like a normal baby to me until I run into another baby at the store or something and see the differences.
So, we scheduled the MRI. I'll post here after we get the results for anyone that is in the situation in the future.