When do Broken Promises end a Friendship for you?

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I have a friend who has several times promised to do something and then not come thru. One time she offered to take care of my cats while I was out of town on business for 3 days, I came back to find starving cats, with nothing but empty bowls, not even water. And I had asked her to add some Cat litter to the box, not clean it since I did before I left, just add some more since I'd run out of time. It appeared that she hadn't come by at all. My mailbox was full, cats upset and starving and a litter box that was so gross I had to toss it out and get a new one. And when I asked her what happened thinking maybe an emergency came up, she said she'd come by once!! In 3 days time??? It was like it was no big deal! Not to me it wasn't. We were good friends so I forgave her but made a mental note that even tho she only lived 3 blocks from me, she'd never cat sit again. Then several months go by and we are past my disappointment over how she didn't take care of my cats when she was the one who offered!! And she's going on Vacation and asked if she could borrow my Favorite SLR camera with the flash since she wanted to try and take some creative nighttime shots. I loaned it to her after showing her some exposure tricks and asking her to take excellent care of it. She'd taken photography same time as me in college so I knew she would at least handle it properly, respect it and handle the lens changing properly. Well the Camera came back in fine shape, no issues, but she'd lost the Entire Flash Attachment and Mount. And again it was like no big deal. When I opened the camera case and saw it not there, she said she must have packed it with her suitcases. She'd check at home and get back to me. Well...long story short, she lost the Flash which was several hundred dollars and never even offered to replace it. That was almost the end of the friendship but then I talked myself out of it. About 3 weeks after her vacation her Mom died suddenly. During that time I'd have lunch 1x with several others and her and chatted like 2x. So I found myself thinking that we could be friends as long as I loaned her nothing and she never did my cats any DIS favors. I'd known her Mom for years and it was a terrible loss of a wonderful woman way too soon. She was fragile and needed my support emotionally and to help make the arrangements. So I did what I thought was right and was a good friend. I've also gone thru several break ups with her over the last 6 years, hers not mine. Now, it's been a little over 2 years with no problems between us, but I am going thru a Huge life changing crisis and could use her support and help. But guess what,,,I called her Saturday and she said she had plans all the way til Sunday night. And she already knew about my situation since I'd sent a quick e-mail to her Okay, I think to myself once again. She says I'll call you Sunday RIGHT after the Super Bowl and never does!! And I work from home on Mondays and this she knows well,,,no call today either. And I know she's got Yoga tonight so .. Am I wrong to say enough is enough? I only have a few close friends and she'd been one of them. But it doesn't seem like she treats my property or my cats with respect. She could have bought me a used Flash / Camera mount and I would have been ok with that since I'd had that one for a few years. And of course an apology which I also never got each time. But at this point, even tho we go to movies and shopping and such and laugh and have fun. I think I'm done with this friendship. What are your thoughts?