Grrrrrrr

all was going well but things have gone a tad pear shaped.
When Katelyn was having a 2 hr nap during the day we were getting a NW which lasted 2 hrs, we reduced her nap to 1 hour and she was sleeping thru for 12 hrs.
Now she waking up 45 mins after we put her to bed at bedtime, lastnight she was awake for 2 hrs.
I have no idea if i should be letting her nap for longer or shorter

Any ideas?
Her EASY (it was working)
7.30 - awake
1pm - Nap
2p, - Woke her up otherwise she would have a 2 hr NW
7.30 - Bedtime