My husband works for a company that specializes in bedbugs and he is the go to guy for bed bugs, so I know a lot from him. You could get bedbugs from her if, say, there are some hiding on her bag, and you brush up against the bag and they attach on to you. However, you will know if you have them. Bedbugs bite, and their bites itch. You would also notice dark red/brown spots on your bed/clothes. Thats bedbug poop and the more you have, the more you will notice their poop. My husband has been working with/treating for bedbugs for years and he has never once brought any home with him. The things is, you have to be careful to never brush up against clothing or fabric materials. If you are entering a home that you know has bedbugs, spray your shoes with alcohol (hand sanitizer), this will help. As money goes, even in the worst of cases, my husband has never treated a home more than 4 times for bedbugs. The average time it takes to get rid of them with an exterminator is 2 times (an initial trreatment and a followup). But, like I said, my husband has never had to go to a place more than 4 times before and it doesnt cost thousands of dollars either.