Help figuring out naptime aka I hate this sleep regression

So, my LO is on a stretch of bad sleep. Wednesday night/Thursday morning she slept until 2:30/3 and would not go back to sleep until 6, and then slept for about two more hours, total of 8 hrs of night sleep. She had 4 hrs of naps yesterday.

Last night, she wanted to go to bed at 7:30(usually she is up until 8), so we started our bedtime routine, and she finished feeding around 8:30, and I put her in the crib. She was awake but that isn’t usually a problem. She can put herself to sleep. It has been a problem during the regression, but she’s asleep by 10:30 at the latest.Not last night... she slept maybe 15 minutes between 9 and 9:30, then was wide awake. I gave her the breast around ten, put her down once she fell asleep, she woke right back up. I ended the night with her bawling her eyes out for half an hr at midnight because she kept fighting sleep until then.

She woke up again at 7am, and has fallen asleep after feeding on the one boob, but if this doesn’t last... how am I going to get her to catch up on sleep she needs? If she sleep more than 4 hrs for naps, couldn’t it make her flip her days and nights?

This is week 5 of the regression.