It is difficult to give an answer with this limited information, but there can be several reasons for fluctuating glucose levels in children - the number of units of insulin that she uses may not be appropriate for what she is eating, or her activity levels may vary. The type of regimen may also not be appropriate for her lifestyle. i would recommend that she goes back to her Health Care provider and discuss this - has she been to a dietician? and have they looked at carbohydrate counting? maybe that can help her to better manage her sugar levels. If she is angry and frustrated just ensure that her sugar levels are not too low.
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