amend 2018 return

My daughter was teaching English in China but had not lived the required 11 months at the time I filled her 2018 return.  I was told to amend her return after she had met the 11 months and she would end up getting money back.  I can not figure out where I put in she has lived for more than the 11 month minimum.  Can someone please help.  Thankyou.