There is a learning curve when you get our first BP and so much information out there (some of which contradicts others). It sounds like you are taking good steps to getting the temp right. Don't be put off by people saying your not doing enough, we were all beginners at one time too (I think I still am even though my collection includes 7 BP now)
-side note IDK where you live but if your tank is near a window or an AC vent or if you keep your place cold it can make it a lot harder to get your temp and humidity right.
I second what a few have said about thawing and heating- thaw in cold water, in the fridge or on the counter (for a fuzzie or a hopper it wont take long), and then submerge in warm water for a few min or use a hair dryer (I personally love the hair dryer method, my snakes come out of their hides when they hear me start).
-Don't take your BP out of her enclosure (for a while this was suggested and now people are tending to agree that it can just add stress) I don't know if you do this but just incase.
-Feed in the evening with lights low.
-If you are trying to feed hopper you may need to go back down a size as she may be too weak from not eating for an extended time.
-If you get temps right and she still is not eating or not eating regularly you might need to move to live- you can usually find suppliers on FB or craigslist.
Keep us in the loop on how things are going.