I ihave one child with ADHD and SPD, and one child who is NT (or at least, if she does have some ND, which I suspect she does, it' snot particularly negatively impacting her life and therefore there's no need to do anything abuot it. I will be monitoring her as she goes into High School in case it does start to impact her).
Your dd sounds like my DD at that age (the NT one). I saw it as a lack of resilience. In our case, she is younger, so not an only child, but she was a child who tended to find a lot of htings very easy, particularly in comparison to her older brother who had had a much tougher time - which was obvious to everyone, including her. As a result, quite frankly, she had no idea how to cope when things didn't go her way, or weren't easy.
We have worked on this extremely hard over the last 6-7 years and she is much much more resilient now. Sometimes, I think she's faking it, but I take that as a good first step eg Fake it till you make it.
Re the friendship stuff we did a lot of repitition, "No, it doesn't mean they don't like you if they don't want ot play the game exactly the way you do" etc etc etc.
Also, I worked very hard NOT to play into the drama. I wasn't dismissive, but I wasn't going to get overly involved either. I wanted her to realise this was just normal life.
With other things, it was constant encourage to try again when it wasn't easy the first time. Sometimes, she'd be having a mini tantrum about how she couldnt do it or whatever and I'd get firm, "DD, just because you can't do it perfectly first time doesn't mean you can't do it. You need to keep practicing." Never ever buy into the drama, never agree she's terrible, but also I didn't spend hours and hours reassuring her either. (To be honest, this is the most ADHD thing she has - I had to learn with DS that when he was in an ADHD spiral, reassuring him and going on and on made it worse. I needed to make one, firm, clear statement then refuse to engage further.)
She joined an amazing dance school with an incredibly supportive and inclusive atmosphere. It's been a huge help to her. I thik any kind of extra curricular with the right CULTURE can be hugely powerful for children like this. They get the support of coaches/teachers, they meet different people and tif the culture is right in these groups, the entire vibe is about doing your best and working to improve, rather than absolute success. I want her to start doing more traditional team sports now but I think she would have struggled with those when she was younger. So dance, martial arts, swimming, art classes, gymnastics, cycling etc might be better choices.