Hi, This is a blood spot , in all probability due to minor trauma ..
Presuming she does not have any health conditions...and no decrease in vision in that eye .
Dont know the age, if she wears contact lenses...that also can cause it while removing / pinching etc..if so , avoid for a few days
If all these issues not there, u can add lubricating drops as well...genteal 3 times
It will take some time to clear.
Next Steps
any red flag...decrease in vision, more discharge etc ..show to doctor