Can A Leopard Change Its Spots?

A slightly different tone this time as I've got something on my mind.

Yesterday, I heard a story on my local radio about a support group for new mums. The organisers were looking for mums who'd been there, done that and bought the t-shirt to lend the benefit of their experience to those just getting to grips with the parenthood thing.

It made my ears prick up. I had terrible post-natal depression after The Princess was born, and this sounded like something that could help save other women from the same experience.

Granted, I wasn't sure how I'd fit it in, what with looking after my own family, trying to run a business and have a life, but I wanted to try. Until I heard the spokeswoman, and realised it was someone I used to work with. Someone who had turned out to be not much of a friend, without going into details, and with whom I didn't really want any contact.

Part of me says it was all a very long time ago, let bygones be bygones, and put aside any negative feelings for the greater good. Part of me says no, it's unlikely she's had a personality transplant and stay away.

So I haven't called. I'm telling myself I don't really have the time, but I know that's not the real reason. I do think I've made the right decision - but I also feel guilty in case I could have helped somebody.
Am I wrong - could the leopard have changed its spots?