She did know I wanted it in a specific colour, the first thing she said when she rang was "it's not exactly the one you wanted but it's x brand..." I assumed she meant the style was slightly different (there are two versions that come in the colour I liked). I do think the colour she got might have been cheaper than the one I wanted, so no idea how I'd return it and add on the money for the other one (if they even stock it in that colour), without her knowing, surely she'd get automatic e-mails etc? It's still in the box, but taken out of the parcel wrap so no website info or anything, though I could always just ask where she got it.
I spoke to my mum on the phone, who suggested I hold on to the money I'd saved, use and keep this one long enough for her to forget about it, then sell it and get the one I want (and pretend I swapped it with a friend or colleague). But the more I think about it, the more that seems like an awful waste of money (I'd probably get half the rrp or less that way).
I think I'm just going to hold on to it. I'm less bothered than I was now, I think it's because when I went to collect it, it wasn't what I was expecting iyswim (I had no idea it even came in the colour it is). It's quite unusual (not in a bad way),and I think that's weirdly making it grow on me? And I can use the money I saved for something else I need.
"In future don’t talk to her about things you want or are planning to get, or you’ll have a lifetime of this sort of thing".
^Yes, lesson learned! I'm generally quite proud, don't like people feeling sorry for me, the thought of charity etc. I hope she didn't think I was hinting, when I mentioned it 
(she's been hinted at this way before, but not by me! ). I was just proud to have finally saved enough for this thing, (and it was relevant to the convo).
It's a non essential thing, and I already have a cheap version (that I can now get rid off), but it's something that I'll use every day, and will make life a lot easier. She's very generous, and has been taken advantage of in the past, so if we go for lunch or whatever, there's always an argument about who pays.
I've been trying not to let people call me silly or childish for standing my ground (and learning to say no), but things like this still throw me (I would have insisted "no thank you" if it hadn't been too late, though I think she waited until it was en route to tell me she'd bought, so I couldn't say no? Which is surely a bit odd in itself..?) but anyways, I'm not going to look a gift horse in the mouth, but I'll know to button my lip in future. She does that thing a pp mentioned, of buying stuff for the dc that they've added to their lists for santa etc, so you'd think I'd know by now.