How to make friends

The only person who I completely trust and would tell anything too is my best friend and she like my is autistic and we don't mind the social interaction with eachother maybe your sister could try and meet people like herself

me to

Couldn't agree more

I am so socially awkward, I've no friends at all. I'm always as nice as I can be but no one has ever wanted to be friends with me sadly. I find friendship really difficult and confusing. I desperately want a friend but I don't know how to get one.

Yeah, that was my experience too. Fortunately whilst the words may be unspoken, the rules have been discovered, and written down many times over the years, and are there to be found, for those of us who didn't have them already "built in" though either nature or nurture.

One definition of a friend is "someone you can call at 03:00 and they will give you their time". (sounds more like samaritans if you ask me, but I know where he is coming from. Your friends strengthen your life and hopefully you give them your strength in return). 

Having Autism means I think process and react to the world differntly from the majority. My lack of interioception measn I don't always know what I am doing socially and as many of us know, if left uncorrected that state of affairs can lead to awful isolation from your fellows, with a seemingly unbridgeable gulf between you.

I obtained the single "yellow submarine" by the beatles when I was six or so years old, and on the B side is a song called "Eleanor Rigby", which talks about "All the lonely people, Where do they all come from?" Since I was already one of those at that point, (and about to get MUCH lonelier too, for a whole bunch of years!), I took note of those lyrics, and have tried to steer a different course.

Kiki cat's approach essentially is a good ditillation of what I have learned, although I've taken a more engineering approach, where I've obtained a more "how it works" approach to friendship. A part of "positivity" & consistency for me was found in obtaining a mechanistic understanding of how people relate from a variety of sources, as well as my oft mentioned Eric Berne book, and using that knowledge to help me execute my desire to be a useful and enjoyable human being. Kiki is also right, about teh vulnerabilty aspect, if you mention yoru lifes reverses to much, you can end up with friends who sudenly are NOT your friends when your life improves! (That happened to me in my late twenties).

The biggest way to lose a bunch of friends is to "change your life", and it can be a huge challenge to carry some much valued friendships though a house move, or a divorce or a new partner etc.  

FRIENDS... what are they? Jokes aside, I actually gave up making friends  There is so many unspoken rules of friendship it's so confusing

I think you are, based on this one post!

It takes a lot of work for sure and I've been very, very lucky in this respect. When I was younger a wonderful person decided she was going to be my friend, "adopted" me, and we and her other best friend at the time have been inseparable ever since. 

I would say, have her find a forum or some sort of other group that shares a common interest like a book club, or some other social club that deals with something your sister likes. It can be really hard to open up sometimes out of a fear of saying or doing the wrong thing, but if she enjoys the people there and they are good people, friendship will come (based purely on my personal experience). It really helps in making friends when all of the people involved share a similar interest. For my friends and I it was Greek Mythology and reading. 

I hope this helps some. I'm not really good with advice.

maybe she'd like using a forum like this one