Been thinking about posting this for a while, apologies if it's long.
I have a good friend, who is lovely, and whose daughter is very good friends with my DD - both in year 6, so 11 years old. Her daughter, let's call her Beth, is a really lovely girl. She's kind and funny. DD and Beth have been friends since reception, they struck up a friendship because her and DD are similar in a lot of ways - a bit shy, not into really "girly" things.
All was well until the last couple of years. As DD has matured in the way most kids do around this age, Beth hasn't. She still wants to play role-playing games like "families" or to pretend to be a cat. DD went along with these games for a while but started to try to gently suggest they do other things at break time, like play tag or football. This would make Beth cry, run away and hide. So DD stopped saying no, and played along with her, even though she felt embarrassed.
I spoke to my friend and after a talk with her DD, things got better. However, Beth now will not tolerate DD speaking to other friends, and will physically create a barrier between DD and other children, push her away from them with her body and talking to her loudly so she is forced to abandon her conversation. DD says when she says something about it, Beth will run away, hide and cry. She's very attached to DD and her mum has told me that when DD is ill at home for the day, she will often come home crying because she misses her.
From what DD tells me, and from what I've seen having spent lots of time around Beth, many social cues go over her head and leave other kids feeling uncomfortable. For example, when talking to someone, she will stand an inch away from them, almost nose-to-nose, and won't notice them backing away. My friend will see this too but doesn't say anything. She also struggles with volume control so is often standing close and shouting in children's faces.
She's also very literal. If someone makes a joke she'll not really get it, and when its explained she will laugh extremely loudly and for a very long time - which is absolutely fine, but other kids notice and look at her funny. I've seen this happen quite a bit.
I have very gently suggested that Beth may be on the spectrum, and have been met with a very polite but very forceful "absolutely not, she's just weird and wonderful like me"... and I've left it.
But they're about to go to secondary, very likely together, and DD is really worried that Beth's behaviour will a) get Beth bullied, and b) be very difficult for her to "manage" - DD says that a lot of her time at school is spent making sure people aren't horrible to Beth and trying to make sure she's included in things. I have emphasised tthis isn't her job and tried to encourage her to draw some boundaries but she worries about hurting her feelings and making her cry. It actually causes DD quite a bit of anxiety at times. It's something we're working on.
My older DD is autistic. This does NOT make me an expert, obviously, but I see so many traits in Beth that are so like my DD, that if at the very least acknowledged now will make life so much easier for her in the future.
I feel like I can't say anything though. My friend is very defensive about Beth, and it's a source of pride for her that she's, in her own words, "a little weirdo" - but DD isn't happy either and they're going to continue to be friends.
I don't know what to do, I know it's not my place. Do I just encourage the setting of boundaries and mind my own business? I consider Beth's mum a really good friend and nobody seems to be addressing her social issues.