If the elders find out you have been living at her place before you were married and you were both alone, I doubt she will be allowed to remain a pioneer at the very least. More likely she will be reproved, maybe disfellowshipped depending on the circumstances of your living arrangements prior to marriage.
An active pioneer secretly marrying a worldly guy would almost be an embarrassment to the local cong. and they may want to set an example for others.
Thats short term. If she keeps going to meetings and shows everyone that you married for love, eventually she will probably be able to pioneer again.