She's not that likely to encounter it at this point. Daycare and school children are required to be vaccinated for Chicken pox these days. I had to get more creative to get my non-vaccinated, homeschooled kiddos exposed and over the virus before our CF came home from fostercare for that reason. Unless she's not vaccinated for Chicken pox, even if she is exposed and contracts it (and even vaccinated you can still contract it) she'll have a mild case.
Now, vaccinated you can have a mild case up to 5 times before you can trigger your own immune system to prevent it again. But, with the vaccine it is a mild case you'll contract just the same.