You are not a failure when you are doing your best and following your mommy heart and brain.. You are pregnant and you are exhausted. You must take care of your health. You all are also about to have a huge move and change in your lifestyles, so again there are going to be transitions.
Yes, it sounds very normal for your daughter to not want to take an afternoon nap.
But she really needs that afternoon nap. putting her to bed at 6:00 means at about 1:00 she could be wide awake. If you could push that sleep time to 8:00 or 8:30, it is going to help YOU have normal sleep.
What I would suggest... is to tell her during lunch time, is that "mommy needs a nap". "Will you please help put mommy to bed and lay next to her quietly so she can rest?"Have HER read you a story, have her pat your back..have her put a blanket on you this will give her some control and some close time with you.
We always played quiet music for our daughter each night. She liked Vivaldi.. We played it quietly and eventually she would hear a few notes and just drop off.. As she got older we found some childrens books on CD that she liked to have played as she fell off to sleep.
When your daughter wakes up in the middle of the night do not turn on any lights. Try to do it all in the dark. Use a very low voice. and try not to make too much eye contact. You could also have a sippy cup of water or milk ready for her. Tell her "mommies milk is too tired". Or if you are ready to stop BF all together, some moms have suggest putting bandaides on their breast and saying "there is no more milk."
Hang in there. We have all been in the same spot..
Have a wonderful holiday. Give your babygirl a big hug. Our babygirl is now a junior in college far away, so she is not here till Christmas. This time with your child really will fly by.