Put in more food she wouldn't eat if / until her life depended on it, maybe just more survival bars - whatever she is sure to find gross.

Water treatment supplies.

Multi-tool.

Hide some money inside laminated labels or card; maybe in several places. Do not tell her it is there.

Include a do-not-open-unless-it-is-an-emergency letter. In addition to whatever words of love and wisdom, tell her where to find some of the hidden money.

Keep the location of some of the money out of the letter so you can do something positive to help her over the phone, email, whatever.

Copy of id.