Help with early wakes BF co sleeping 10 month old

For the last week my 10 month old baby has woken every other day around 4/5am for 1-1.5 hours. I get her back down either by feeding/patting, or rocking. She then is v tired and sleeps in longer which pushes naps back/maybe means she’s getting too much daytime sleep. She then sleeps a good night that night, but maybe it’s amounting to too much sleep as she then keeps waking early the next night?

She is breastfed and we’ve always co slept. We feed and rock to sleep. Sometimes she can fall asleep from feed and cuddles in bed alone but I notice it’s not usually as deep a sleep so often rock her anyway to limit false starts. I don’t track night wakes/feeds as they’re usually very minor stirs every 2-3 hours that she and I both mostly sleep through, and although ideally I would reduce these in the coming months as I go back to work beginning October, my priority right now is getting her to sleep through the early morning. 

We have been doing 2 naps for about a month, co sleeping or start as co sleeping and I slip out when she’s fully asleep. Staying with her for the first stretch (40-60 mins) does seem to be the only way to get a nap to last more than 30 mins. She used to reliably sling nap but around 8-9 months that got tricky so I’ve kept all sleep in the bed recently with associations (white noise, sleeping bag) and it helped reduce the time it took her to fall asleep a LOT (down from min 20 min rocks every time to 5 min rocks). I’ve got two travel days coming up end of Aug/in Sept where she’ll have to nap in the sling or pram so I’m planning to start trying some non bed naps soon. 

I’ve been trying to cap daytime naps at 2 ish hours total and hope night sleep will be 10.5-11 hours, as she seems to sleep around 12.5-13 hours total. The last two days she’s had a 1h20 morning nap and 40 min afternoon nap. I’ve been doing 3/3.5/4-4.5 wake windows. She is super sleepy at nap times and falls asleep vv quickly, but takes about a 15 minute rock at bedtime. We don’t have a consistent bedtime, just usually up to 4.5 hours after last nap wake up. This has been getting quite late recently (8:30pm ish). 

Could she be ready for a 1 nap day? Do I need to be strict on a 6:30 or 7am wake up to ensure there’s enough time for naps and wake windows? Do I need to spread awake time more evenly through the day eg 3.5/3.5/3.5 (it just seems like she might be too sleepy to last 3.5 for her first wake window)? Do the naps need to be the same length (1 hr each)? How do I build enough sleep pressure to last the night without overtiring her? 

We are about to set up a sidecar cot to gain extra room in our king bed as she’s moving more in her sleep/rolling away from me at night and I’m also hoping that might help her sleep longer stretches without seeking to latch in her sleep. 

She is starting 4 days a week at a childminder at 12 months who will either do 2 naps (AM in buggy PM in cot) or one nap in cot depending on what her schedule is at that time. 

In short - her sleep has never been great and she needed a lot of help to fall and stay asleep as a newborn, co sleeping has been SO good for helping us get more sleep as she seeks comfort and feeds frequently. I expect this has contributed to her sleep behaviour now and I’m really happy to keep co sleeping as long as it actually helps her and me to get more sleep. But I need to get her back to sleeping through the 4-6am window!

Early wakes BF co sleeping 10 month old. Please help!