Hi. I t sounds like maybe she got scared a bit to have her emotions running high for you while you are still involved elsewhere. She may not know how this will play out for her so she has decided to cut things off before it got too involved for her and the gift may have been that indication to her that you have an interest but also aren't really free to pursue fully. I would sort out for you what is going in in your relationship and then if you are available pursue your other interest but until such time I would not pursue anything else.
Let me know your thoughts.