I know it's hard, it's going to take a little time and a little assistance for her to adjust and get into a new routine.
If you want to push her harder so it goes faster then do so. There's a risk of OT, you know that, but she'll adjust to it.
The first A needs increasing (go up to 3hr 30 tomorrow if you think she can manage it)
The first nap could do with some assistance extending if you are able to leave your DS whilst you do it (I'd go in at 35min and hover over her ready to shush/pat or whatever your adapted version is so ease her into the next cycle as quickly as possible).
You might be looking at something like this:
WU 6.00
A 3hr 30
S 9.30 - 10.15
A 3hr 15 (or push harder 3hr 30)
S 1.30 - 3.00 (or 1.45 - 3.45)
A 3hr (reduces this A to BT to help bypass the CN. 2hr 45)
BT 6.00
It's only a guide. Remember all LOs are different and you're the only one who knows your LO, what she can handle, when she is getting grouchy and tired etc.
You are on the way there. There's almost always some CN days during the drop from 3-2.
((hugs)) for you Becky. I know it seems like it takes a while, it just can't happen over night but you are making headway.
xx