I feel like I'm failing her

Today my kids brought home their progress reports. I've been dreading to see my daughters for certain reasons. I see my son and he is doing well (he's in kindergarten) so when I see my daughters (3rd grade) the first 2 subjects she was doing fine but in reading, writing, comprehension and math she has a 2 (still in progress) and there was a note stating her reading level is 228 and for a 3rd grader her levels should be between 538-838 ... she had this same problem back at her previous school. I just have no idea what else I need to do to help her improve. I do not want her to fail, she already feels pressured and gets nervous and does bad. What can I do to help?