Breast cancer question…

So my mom was diagnosed with breast cancer and she went through chemo and radiation. She finished her treatments and now she is taking a chemo pill / hormone blocker. This obviously has no effect on her being around my son (he’s 5 months old). Right? I know during her chemo treatments we had to be careful so I didn’t know if anyone knew anything about this. The medication she’s taking is called Arimidex and she has to take it anywhere from 5-10 years. Thanks in advance!