Sounds like she was the doormat. She didn't want to do it, and instead of saying no, she came up with excuses why she "couldn't": nowhere to store things, unable to make trainings. You, understandably, didn't realize she was trying to get out of it and instead made arrangements to accommodate her difficulties.
She should have just said she wasn't interested in doing it, period. Or too busy, or "that won't be possible" or "not this time, thanks for asking." Instead she beat about the bush as so many of us do when asked to do something we don't want to do.
Yep, this is what I was thinking too. She was trying to say no but never actually said it.
I had a similar situation in a work-related issue. Sort of.
Basically an acquaintance, Ally, who was/is close to my BFF was hired by my boss to take over part of my responsibilities as I wanted to go part-time. At my recommendation she was hired. My mistake.
I let Ally know that if she needed some time off, to call me and we could arrange me taking over her responsibilities. Well, she and her husband were really hurting for money and she told me her husband, Carl, was actually better at the job and was helping her do it (work at home) so when she called me to take over the job for 4 days, I asked her if she just wanted Carl to do it and I would pick up the products and deliver them for them. I didn't mind doing the job at all, but I knew they were hurting for money so I thought I might be doing them a favor. She said, "Well, that's an idea." I said, "Is that a yes?" She said, "Okay."
So I pick up the products without incident for the four days and deliver them only to have my BFF tell me a week later that Ally is griping and whining about how I said I'd do the work if she needed time off but instead I foisted it on to her DH. I'm all like
So I went to Ally and explained to her that I wasn't trying to not do the work. I thought I was helping her and if it's not helping, she has to actually tell me that. She was embarrassed and understood me.
But that was a work situation and not a volunteer one. My point in sharing is that while we discussed the miscommunication (which was based on her
miscommunicating) I knew full and well that she was not going to change her communication style to a more direct one, nor would she probably quit griping about me to my friends. I don't know how I would have handled her better going forward, because she decided to quit, thankfully, a few weeks later.