YANBU, Mykids!
My mum has a tendency to be like this too. When I gave birth to my eldest child, she insisted on coming every morning for a week after my dh went back to work, to "help" me + give me a rest! People were saying, "Oh aren't you lucky having your mum on tap, wish I'd had that support, etc".
Trouble is though, like you I'm sure, I'm quite an independent person and she did get on my nerves, constantly watching me with the baby + saying how differently she used to do things, (her way was right of course!) If I so much as sat down with a magazine when the baby was asleep, she'd keep pestering for something to do to help, + by the time I'd shown her how to use the washing machine/cooker etc the baby would have woken up! I actually got less rest than if I'd been on my own!
I'm also a non-driver but very used to public transport. Even now she seems amazed sometimes if she phones up + we're just going into town/visiting a friend etc by bus/taxi. It's "Oh you should have said, your father could have taken you, why don't you wait half an hour, we can give you a lift!"
If we're going out I tend to let the answerphone kick in if it rings before we go, however if she rings my mobile once we're there, I'll answer it. Don't mind her meeting us at places, but I don't want to give up my independence by accepting a lift, unless absolutely necessary!!
I did tell her once how criticised I felt, but to be honest she was amazed, she had no idea she came over that way! Since then though, she's got better + tends to think before she speaks. In terms of the transport, she bites her lip when I say we're going somewhere, I can see she's itching to volunteer my dad to take us, (he's the main driver of the two!), but doesn't like to which I'm grateful for!
I do realise she means well + have been grateful for her support at times, but I think that generation have quite a "forceful" way of offering help!!