It's 6.5 months in and still no routine!
This is actually very common - don't feel bad about it at all! Very few babies follow a good solid routine before they are on two naps a day... there will always be speed bumps along the way.. between 5-12 months, A times increase very rapidly and it can be hard to keep up!
You don't need to stay home forever, just a week or so to figure out what her sleep needs really are.
If you do set naps, you do just that, you set a nap time for AM and PM and stick like glue to it... you can offer 15 mins early or 15 mins late, but that's the only flexibility there is... bedtime has a 30 min window to move around a bit... so, if bubs has a short nap in the AM, the A time to get to that second set nap time (even using the full 15 mins extra bit) can lead to killer OT.. which could mean a short PM nap as well and then further OT up to BT (since that is set too!) The idea is that baby's body clock will regulate to the times sleep is offered... but, it can go horribly wrong too!
I am really tempted to use A times with your DD since she can be sensitive to OT...
As for OT/UT:
30mins - almost always OT, but can be UT if A times are far too short for age (mood at wake will tell you which it is)
45 mins - UT
anything around 1hr - 1hr 15 mins - UT (this changes as baby gets older though and moves to one nap... then it's easy, anything under 2 hrs is OT).
If she woke crying after an hour nap, she was likely *almost* at the right A time before the nap.. she was UT (since she woke up early) but was crabby because she was still sleepy and just couldn't quite get back to sleep...
Knowing this - let's try a 2 hr 45 min A time in the morning and see how she does. If she naps 90 mins or more, repeat and do 3 hrs of A time then PM nap.