yup, LisaRose and Jgnat called it. Time to develop boundaries, learn how to pleasantly say no. Also time to look yourself in the eyes (takes a mirror to do that!) and tell yourself when you are being petty. You're confusing the overall issue of this woman's disrespect for your boundaries with the meaning in some material stuff.
Learn to recognize and deal with manipulation.
Save the special stuff that means a lot to you, discard the damaged/stained stuff, give her the rest. I wonder, too, why she is such an attention-grabber. Is she incredibly self-centered, or empty and continually in need of validation? People are so complex.