Baby drinking every 1.5 hr

I breastfeed but my daughter eats every 1.5 hours and she’s 4 months, lately she’s been waking up more often to dream feed and I can’t help but feel I’m not keeping up with my milk production. She’s getting older and obviously needs more ounces but she won’t eat more than 3 minutes each feeding. Anyone have tips? I try supplementing with formula but she always ends up fussy after drinking it and spits up a lot.