Over 4 month old won’t sleep

I have a 4 month old little girl, will be 5 months on 4th April. She has been a really good sleeper (sleeps through with out a feed from 9:30pm to 7:30/8am) but the last week she has been waking up at 11pm and every 40 mins till 6/7am in the morning. I’m up with her all night and all day and can’t keep functioning like this. I have googled that there is a 4 month Sleep regression. Does anyone have any helpful tips or anything to help try get her to sleep. This is one very tired mother lol.