Cow milk allergy... formula suggestions?

So far we are EBF. Baby girl has been diagnosed with a milk allergy. Our breastfeeding journey has been a painful one. Thrush multiple times, clogged ducts, mastitis, now a milk blister. I want to start supplementing some during the day with formula. Just to give myself a break. I have so much frozen breastmilk, but I wasn’t dairy free so it does me no good 😭😭😭

Anyone have experience with dairy free formula? I have no experience with formula so I’m not sure where to even start?! I am not even sure I’ll actually use it. I’m just super fed up today from the pain of the blister.... my plan is morning and nighttime nursing and then bottles in the day. Obviously I will do the transition very slowly so I don’t upset her tummy.