D.J.
I would keep encouraging her, set the timer so you can remind yourself to take her to try. With my daughter, I always told her she had to try even if it didn't work, we knew she sat down and made an attempt to go.
You have a new baby in the house, and I had the same situation, 2 in diapers and couldn't wait for the oldest to be potty trained. She may just not be quite ready with all the changes at home right now.
When my daughter was 2 1/2 she bacame severely constipated while I was out of town for 4 days. This cycle lasted for 8 months. We stopped potty training at that point until she turned 3, at the advice of the doctor. I kept the potty chair in the bathroom, if she asked to use it, we put her on it. But it was pretty much back to diapers. This happened before I had her sister. Anyway, I just wanted to say sometimes it is one step forward, two steps back with the potty training. My second daughter would go on the potty at 18 mos. though we knew she was no where near being ready to potty train. Then we tried when she was older, forget it. One day, she had just turned 3, she walks downstairs and announces "I think I will wear panties today" and that was it. No accidents, in fact we left town 5 days later and she made it to the airport, and the plane ride with no problems. Good luck, it will happen, be patient, expect there will be setbacks but do consider she may not be quite ready to be a big girl right now with a newborn in the house.