What business is it of yours? Unless she's your wife, who cares. Lots of men and women 'go shopping' for lots of different reasons. If there's a problem in their relationship it doesn't matter where she or he looks for entertainment. There are 'cheaters' at Church, focus on your Life.
She is either a very bad person, or perhaps she is at wit's end. If this is your wife, you two need to get into counseling immediately. If it's just a rumor, please don't repeat it, because all it will do is cause damage.