Hi,
If the
blood test done earlier have come come out all normal then i guess this looks more like apsychological issue where she could be trying to get your attention.Give her some time ,talk to her about her daily activities,her school and any problems related to her peers,maybe that might help and you might find an answer to her such kind of behaviour.Ensure a good well balanced diet and if she still continues like get her evaluated by a
psychologist.
Bye
take Care.