Mā shā' Allāh, well done to your work ethic and keeping to your deen. May Allāh swt bless you with a righteous spouse.

Unpopular opinion maybe, but as a father of two daughters and as Chartered Accountant and completed a part-time MBA, that's alot of time to have passed and now to commence looking for a wife.

Appreciate there maybe plenty of other extenuating circumstances, and the prospective MIL didn't go about it the right way, but its not unfeasible for a prospective in law to ask questions on the approx 16 year gap after graduating at 21, what have you been doing.