Firmed stools when on antibiotics for an ear infection

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My 3.5 year old daughter has chronic loose stools. I've been trying a lot of

things with her with diet.

Her stools go from mushy or liquidy to well-formed and fully digested when she

is on antibiotics to treat an ear infection (last year, she was on an antibiotic

twice for an ear infection).

She is autistic and non-verbal and cannot tell me what's going on with her.

Right now, I'm trying everything I can to firm up the stools again but I'm just

getting mushy, poorly formed stools. SCD and GFCF and probiotics are doing

nothing for the stools. We've also been trying enzymes, but to no avail. They

were firm again in late November for a while, but that was just after she had

been on the antibiotics for an ear infection. Weeks after that, her BMs

degraded back to the usual mush, sometimes not fully digested even with enzymes.

Has anyone else seen this in their child? How should we approach this?