I visited my friennd

Today's my off day for from working all of month.

I heard that my friend "Eve " was sick, then so I visited her.
She was had appendicitis status and was in post-surgery treatment 3 days ago.

Today, she looked more refreshed and try tried a step diet.

""""

Corrected:

I visited my friend

Today's my off day from working all month.

I heard that my friend Eve was sick, so I visited her.
She had appendicitis and was in post-surgery treatment 3 days ago.

Today, she looked more refreshed and tried a step diet.

purple = general correction
blue = capitalisation
grey = something that's not needed

Nice work!  I'm sorry to hear that she was sick, but it's good that she's in recovery now. ^^ Keep going =^)