Supply significantly dropped after being sick

We’ve all been passing Cold/flu back and forth between us (me, partner and daughter) since before Xmas. My partners probably been hit hardest, my daughter is just sniffly but still feeding fine.

I didn’t feed her from the breast any less than usual (I didn’t give any bottles) and I expressed no more or less than I normally would but my supply seems to have dropped a lot.

So much so that for the first time since the week she was born - I had to top my daughter off with some frozen milk today.

I was pumping about 10-15oz per day before and I’d say about the last 2 weeks that’s dropped to 4-6oz per day. Apart from being sick I’ve not changed anything.

How can I get back to 10-15oz or is this it now? I already pump 4-5 times a day after feeds so I don’t want to have to pump more as between her 8-10 feeds and pumping I’m averaging anything from 12 to 15 times a day and my boobs feel it 🤣