well, firstly i would let my friend worry about it, not me.
Secondly, if the account has monthly charges, and she just takes all the money out, but dosen't close it down, she will start accruing debt won't she? If she ever thinks she will want to go to the USA again, it will be a good idea not to have accrued (say) 10 years worth of debt there, therefore the best and correct course of action is to write to them asking them to close the account, and sendher any money left over. I really don't understand what is so hard about this or why she dosen't want to do it