Thanks everyone, for your replies.
I had a long chat with my Mum, on the phone, this morning. I told her about how I feel kind of vindicated, after years of feeling that people were judging my parenting, although my parents have always been very supportive. I explained about how my daughter had to learn how to do some things that other kids just picked up naturally. E.g. It took us a long time to encourage her to say 'Please' and 'Thank you'. Her 'lack of manners' was not due to me not bothering to teach her. Most parents don't even need to teach manners, as their kids just follow by example. I was doing much more than most and it had little effect (and often a negative effect). I've even fallen out with my in-laws, over some of their criticisms of the way my daughter was turning out. That said, she is very polite these days. She has learned and I'm very proud of her for that. My Mum hadn't even realised that I was going through this.
Therapy has not been recommended, at this stage. We were told that we're doing everything right. There has been a big improvement since the initial referral, so we're hopeful that this will continue. She's very bright and it seems that she's learning, from observation, and doing very well. But, we have an option to access psychological services, when and if we feel it's necessary.
I will continue to read and read. At least I know now that I'm not barking up the wrong tree and reading the wrong books.
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"We act as though comfort and luxury were the chief requirements of life, when all we need to make us really happy is something to be enthusiatic about." Charles Kingsley