Do I get a 2nd dog or not?

I've always been a 1 dog person. I got a dog last year who is very sweet, but very cuddly, anxious, and doesn't like to be alone. She came from a house with multiple dogs.

I wonder if there would be a benefit to her to get another dog, or if it would be harmful? She's friendly to other dogs, but I want to make sure that she can relax at home.

I am perfectly able to provide for 2 dogs. I would happily have 100 dogs if I could. I just want to make sure that it's the best environment for my current pup.

Tldr; 1 dog or 2 dogs?