Once a cheater always a cheating . You can forgive her but you must keep 1000% eyes on her , but be careful who search will find , so if you keep not trusting her you will complicate your marriage life , for sure trust will never get back 100% so either you just forget and ignore , or keep on and keep searching .
i suggest if you wanna keep an eye on her is to monitor her cell phone * 90% of cheating can be caught by the cell phone * you can find many online , the one i use and recommend for you is spybunker but be careful if you are not 100% ready dont go for this option you might get hurt again .
cheers