She’s not “shy”, she will just be:
- a pedophile
- if discovered (at least in the first year till he’s 16) guilty of a crime
- even if discovered when he’s at least 16yo, it could be detrimental for her image and place at work.
She’s in the wrong -even if it is less wrong, having read this chapter- , but she’s not a complete stupid. She knows the possible consequences of her actions.
Surely, you can say “let’s try to keep it a secret for 3 years”. Not so easy...as we can see in other mangas too (with OLs or Teachers).