I have gone through your query and understood the concern. The endometrial thickness along with an absent menstrual period is suggestive of hormone imbalance
. Excessive and unopposed estrogen
secretion can lead to proliferation of the endometrium. She needs to be investigated for hormone issues like polycystic ovarian disease
, abnormal thyroid profile and high serum Prolactin
. She should also get tubal patency tests, ovulation studies and if the male factor is normal, induction of ovulation also may be tried considering her age. Withdrawal bleeding may be induced with a course of hormones after proper clinical evaluation. Hope this helps.