She said she was looking for a writing buddy, not a beta...
You're right, there is difference between the two. But the gist of that thread would apply to writing buddies as well.
The main thing to consider is that the more active you are on this site, the more people will get to know you, and the greater chance you'll have of finding a compatible beta or writing buddy.
I understand from experience that it can seem daunting when first starting out here. I'm quite shy among people I don't know, and it took me a long time to feel comfortable among the community. After a while, though, I found my groove and felt that it became easier and easier to express my thoughts.
I'd recommend finding some topics that interest you and offer a few posts here and there while becoming more involved in the community. You'll make some friends along the way and be in a much better position to find a beta or writing buddy that suits your needs.