Waking up at 4.45am!!

Each nap is 1-2 hours or that's the total sleep for the day?
How long is the last nap?
What time do they wake and nap through the day?

There is a sleep regression at 4 months where they change how they sleep which could have something to do with it?

I found a slightly later bedtime helped give more of a night sleep stretch.

If each nap is 1-2 hours then it sounds like she's getting too much daytime sleep: she should be having about 3 hours total, iirc.

That is a lot of daytime sleep so sounds like she's done her sleeping for 24 hours by 5am

Presuming you are saying she does 2 hrs, 2 hrs then 30 mins that's 4.5 hours in the day then shes doing 8-5 which is 9 hours.

Total of 13.5 hours which is slap bang in the middle of expected sleep at this age.

You have to wake her up after a certain amount of time. Don't stop her from falling asleep, necessarily, just cap each nap.

As Steph said but also the wake windows are mixed up. You want the shortest in the morning, getting longer as the day goes on with the longest before bed so sleep pressure builds.

At the moment they are 3, 3, 2 then 2-2.5

Ideally you'd want the 2 first thing, then 2.25, then 2.5-2.75 and the longest (3) before bed.