Offer help in some way or give her a hug if she's open to it... Did she need to buy some or did she just forget to take medication that she had available in the home?

Buy her a weekly meds box.. it has each day blocked out into its own container she can put meds into .. it makes medication much easier to manage...

These suggestions may not fit, but you get the idea... HELP in some way... "that stinks" isnt' going to make her want to come to you when she's down... or otherwise feeling out of sorts