Drying up.

I'm thinking about letting my milk dry up. Our daughter doesn't latch despite all the consultants we've seen (I've also tried nipple shields). I've been pumping and giving her breast milk. But I can't keep up and I forget to pump. She gets four formula bottles a day. My milk in the fridge has almost no fat in it. I'm just scared that I'll regret letting it dry up. I don't know what to do.