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First time mums

MIL not listening

Just looking for a bit of advice. I'm really lucky to have a "village" and once a week my MIL watches the baby (10 wk), so I can shop/nip to the gym etc. The only problem is she doesnt feed her. Ill have expressed ready to go or formula as back up but she never feeds her.
My LO tends to cluster feed a little on a morning as shes a decent night sleeper, but only really cries at desperation - she puts her hand in her mouth or grunts as early warnings. Ive told MIL this, and asked her to feed when she sees it. Ive tried saying "she was fed 30 mins ago, she'll want another in half hour", but she never does.
Yesterday I explained shed been really hungry and hadnt expressed much as shed fed so much I hadnt had chance, said to give her a little formula as she'll want it in about 45 mins. I got home 3 hours later and asked how much shed eaten.
"Oh, nothing, she had a little cry but we distracted and she went to sleep. She'll probably be starving when she wakes up".
She was starving. And then had both sides (which she doesnt normally do) and ended up more refluxy and messed up her timings all night, so she woke up more through the night (not ideal as we have an event today).
I dont wanna fall out as I'm grateful for the help but I'm running out of things to try. My husband is on my side and wants to tell her not to come if she just wants her "to sleep" and not actually look after her. Any advice??