With the past history of highly irregular cycles, the timing of the next cycle cannot be predicted; nor can it be expected to be seen in a month. If she is not on any contraception
, you should definitely exclude pregnancy
. Hyper-acidity may sometimes be part of the premenstrual symptom complex, but need not be one. After excluding pregnancy, she should get investigated to know the cause for the irregular cycles. Hyper-acidity may be treated by antacids and other medication. Hope you find this information useful. Take care.