Can anyone show me WHERE on the 1040x form a change can be made for exemptions? My daughter accidentally checked the box stating no one can claim her when she filed.

Yes, your daughter's standard deduction will change on her amended return, line 2.

So i just change on the 1040x her standard deduction amount from 12,200 to the 4,199 amount? Her total income for the year was only 3849 so her return amount won't change. And in part 3 just state she didn't didn't check the correct box on her initial return? Looking to get this right the first time since it has to be done my mail now and trying to avoid taking somewhere and having to pay to have this fixed. Thanks!

I believe that you also need to leave line 24 "blank".