Okay, bare with me for lots of questions before we start to trouble shoot or get a replacement.
Is there anything she did just before this started happening?
Has a factory data reset been done on the phone since ICS?
Is there an app that she uses or something she is doing that may be triggering the flicker?
If you take it to vzw, they will do a fdr as a last resort. It will also be the one sure way to know if it is a problem with the phone that needs to be replaced or if it is software. If at all possible, you probably want to try to keep your phone rather than get a replacement. Rather than letting vzw do an fdr, I would do one for yourself so you can make sure you save information you want to save. Then if the problem persists after doing an fdr, you can tell vzw that one was already done.
Here is a post I wrote that will give you helpful info on backing up info before doing an fdr:
http://www.droidforums.net/forum/rescue-squad-help/219101-getting-most-success-upgrading-ics-gb.html
Sent from my DROID RAZR Maxx using Droid Forums