C.V.
Have you considered that she might just have test anxiety/difficulty with testing formats?
The best way for kids to get better at reading is just to read. Find great books that they love, and have them read those books. Talk to them about the stories. Read with them (you read a page aloud, and then have them read a page aloud). Reading with them will really help you to get an idea of where they are struggling.
Some kids struggle with reading comprehension because they lack vocabulary. So work on vocabulary. It's hard to understand what's going on in a book if you don't know what all the words mean. Context clues are difficult to identify without a good vocabulary.
I think you're doing the right thing by having her evaluated. And I do think that she'll catch up with some time and effort.