This probably happens because she is using her mother tongue intonation.
One of the activities I use is to say sentences, moving my hand according to the intonation, up and down, and having the pupil repeat the sentence after me; I do it many times until the result is acceptable. Only then I proceed to the next sentence.
For example, the beginning of a sentence:
"I was wondering..." - I start saying it with my hand in front of my stomach, raising it at the syllable "won" and lowering it at "dering". (I hope you understand what I mean