ADVICE PLEASE!! Breastfeeding and family...not eating enough ???

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So my baby girl is 8 weeks on Saturday, and today was my first day back at work.

My mom in law and hubs fed her 4 bottles of frozen pumped breastmilk and she pooped maybe 2 big diapers.

When I breastfeed she poops throughout the day little poops and sometimes huge poops.

They think she isn't eating enough, as if it doesn't bother me enough.

Doctors and wic say she is growin as she should and is actually in the 84th percentile for her height and weight is on track.

I'm worried she isn't eating enough, but I also think the frozen milk may have something to do with it ...

Should I be worried? Please any advice will help ...