I'm a relative newbie, but even I appreciate people checking back in. It helps us know things will be okay and one day we might just get what we are hoping for. And maybe by that time we won't know what to do with it!
WF, I think this is definite temperature checking. She sent them to you on holidays that she thought would help her case by making you nostalgic.
We don't know what she's thinking, but I think this is definite testing of the waters given that she was clearly trying to play upon your holiday-related emotions. You did great with your friendly replies that kept a boundary up. Now she knows that you are most likely receptive, but she has to dig up the courage to be a little more forthcoming about her intentions.
I think you should spend some time thinking about what you want because I think she's going to try to ask to R. Be ready, but of course you wouldn't know anything until you heard information from her about her intentions and how you might find trust in her again. You want to be warm and open but you do not want to let her back in easily. She would value you and any new relationship less if you enabled her such that she didn't have to take risks. Make her find her courage and work, while you remain stable, warm, and somewhat mysterious. (This is not to hurt her, but to force her out of her comfort zone to set up any R up for success.)
