When she was STTN earlier this month she was getting around 3.5-4 hours. This last week with the short naps, it's been as little as 2 hours on some days but yesterday was close to 5 hours. I'm fairly certain that 5 hours was way too much and was the cause of the long NW - I think I can definitely rule out OT as the cause of the NWs. She's consistently had lots of NW this last week, but on days when she's slept less she actually wants to go back to sleep so I agree with all of you that limiting her day sleep will probably help.
Moving her BT back an hour helped a lot. You may not need to move it a whole hour, but maybe see if doing 30 mins later would work?
How much A time do you give your LO before bed?
DH's vote is to drop the catnap but I think moving her BT back might be better because without the CN we'll either have way too much A time before bed (3-4 hours) or we'll have to shorten her day too much. She'll be 5 mo in 2 days so I think she might be too young to go without the catnap yet, but if you think otherwise, please let me know.
Things aren't all doom and gloom today - I think we may have her A time figured out. She put herself to sleep for both naps which she almost never does!!! I think DD knew she needed to do something to make up for last night:)
Thanks for all of the advice - it's really helping my sleep deprived mind sort all of this out.