OK, this IS starting to sound like it could be MBD. It is difficult when they come in after eyes are open - they are more fussy, they don't want to eat, etc., but 8 weeks is WAY too young to be off formula, and not getting what she also isn't from the rodent blocks, since she isn't eating, will exacerbate it.
You need to get supplemental calcium into her. You want a source that does not have vitamin D added - most human calcium supplements do because it is needed to metabolize the calcium, but the amount in human supplements is way too high for a squirrel. Your work likely has something; you can also use fruit flavored Tums (just the plain tablet type, not the chewies) for now. Given her age and size I would get about 300mg of calcium into her daily, broken up into multiple "doses" - not just one big dose.
Some stuff to get:
Any of the first three on this page - recommend the "Picky" and the "Hazelnut" flavors. They taste way, way better than other commercial blocks and 2-3 per day for an ADULT squirrel will provide all of the vitamins and minerals they need daily.
https://www.henryspets.com/squirrel-diet/
One of these:
https://henryspets.com/calcium-carbo...eficiency-mbd/
and this:
https://henryspets.com/fox-valley-da...aby-squirrels/
The formula is for slightly older babies and it is usually REALLY well liked. It sure smells better than the esbilac! It would be really good for this little one to be back on formula and this stuff might just tempt her. Heat it warmer than you think you should.
The formula powder should be stored in the FREEZER after opening, and the bag doesn't tell you to...
I would start getting some additional calcium into her TODAY. Have something ready so you can get it quickly when she seizes to address blood sugar - a drop or two of syrup, molasses, honey, etc., placed right in her mouth after she has a seizure will be taken up by the mucous membranes and will help her to recover.