(((Septie))))
I really, really hope you can work on reframing this for your own best interest. Think about how lovely the flowers were, you did such a good job on them... why not think that some guy cut them for his ailing mother in the hospital? You would gladly have given him at least some of them, right?
If you are absolutely sure it was the women in question, why not take a few deep breaths and then go speak with her to find out why.
In our community,my area had a problem with the flowers being stolen. It is a gated community btw. As I was leaving one day, an elderly lady was unplanting some of the new flower bushes in the common area. When I pulled right up behind her, she saw me and closed her trunk and moved on. I did call the police and gave them the tag number, yes she lives here...etc but after knocking on her door, she didn't answer... I think that was enough to make her stop stealing the flower bushes? Yeah. Maybe if you guess right and speak with her about how sad you are that the flowers are gone... she might offer condolences or at least information. . . but maybe not do it again anyway.

It does your heart poor when you get so upset this way... flowers, esp roses, grow back. Depending upon how much of the branch she took...you know this... I have roses and if I don't cut or dead head them, they quit blooming. The rose bush WHOLE purpose is to have flowers..so when they are gone, it works extra hard to make more! I wish for you in the near future a bush with DOUBLE the blooms