I know it makes you feel defeated and angry..but people should mind their own business. You wouldnt feel like less of a mom unless other people made you feel that way. If youre doing what you can to encourage her, thats all you need to do. I would never let anyone let me feel like less of a mother the way that place did, I wouldnt have been able to deal with that. That proves how much you love her, to have put up with that for her.
Play tables are awesome period, my 3 year old still plays with ours. So, win win if you buy one.