How do I get ink off of a leather purse?

Hi everyone,

I need to get ball point ink off of my Mother’s all leather purse.
My neice decided to write on the purse one day. THe purses is a
natural tan carmel color and it was an expensive item. (Mom splurged
on her self when she purchased this purse.) Now my Mom has decided
she wants it off after 5 yrs. I have tried mink oil but it did not
work. Does anyone have any ideas? Thank you for your time, Janie in
East Texas