Former pledge still wearing lettered bag around campus...

[lemony]

Just a question on how to approach a situation--

One of the girls who was offered a bid to our chapter last fall had to drop out after a few weeks of pledging (I think because of financial reasons, not sure). She dropped out long before initiation, but is still friends with a few members of the fall pledge class who were initiated and are currently actives.

The other day, I spotted her around campus wearing the lettered bag that we give our new members on Bid Day. Additionally, I've seen her in pictures making our sorority's hand-sign with some other chapter members who she is friends with. What is the most polite way to ask her to refrain from wearing letters since she isn't a member? As far as I know she hasn't been asked to return them. It's just kind of an awkward situation since she is no longer in our chapter and it's strange trying to tell former members what they can and can't do...