((Hugs)) Nothing worse than worries around food issues.
Personally, as long as she is taking good feeds of BM or formula I wouldn't worry too much about the actual amount of solids she is eating or not eating. At 7.5 months she doesn't really need any solids for their nutritional value and food is really about fun and learning at this age. We did BLW and often Callie would play with food for an hour and only maybe eat a pea
IMO, your main issue is with her crying at meal times so I would try and shift your focus from her solids consumption to happy meal times
If she wants to play with bowls and eat spoons then I would let her do just that. Put her in the highchair whilst you are eating/washing up etc and give her some things to play with and put some finger foods on there too for her. Carrot sticks (raw) are as good to knaw on as a plate and she won't know the difference
Try and keep things relaxed and stress free and make the highchair a 'good' place to be
Don't know if you have checked out the BLW thread but lots of the babies there have taken a LONG time to eat anything
Ang's Josh took a while, and didn't even lick anything for sometime and now at almost 1 he eats great
My only other thought is whether she is tired around feeding times as this could be causing her upset. Might be something to think about.
(((hugs))) x