I’d tell her, I was really worried about my boss judging me, but actually its about your health which is more important!! Its better to let her know so she has the right expectations about your capabilities than you feeling like you are letting her down and pushing yourself!!
When I go back (8 days PO) I am going to have a risk assessment so we can set some boundary’s about what I can and cant do.. and my boss was really cool about it, and is keeping it secret so there were no problems!
Im sure it’ll be fine, good luck though!xxx