The usual wisdom is "only get another parrot because you want one, not just because you think your parrot needs a friend." So that's what you have to think about. If you do want another parrot, and are able to give that parrot the time and attention he/she will need, then it may be the right decision. Most parrots would love to have their human companions' undivided attention at all times, which, of course, isn't possible. That doesn't mean that the parrots are unhappy, only that they'd like more attention. We all do the best we can and give our parrots as much attention as we can, and though sometimes it may not seem like it, most parrots are satisfied with that. Have you showed your QP how to play with the toys you got for her? Parrots don't instinctively know how to play with parrot toys, so it can help if you play with the toys while your parrot watches. Act like you're having the most fun ever, and it's likely that, before long, your QP will want to join in the fun.
Welcome to the forum. Gary makes lots of great points, even if you get a second Quaker there is no guarantee they will get along. You might end up with 2 big cages and two Quakers that need separate time with you Casey doesn’t really play with toys he just likes shredding them. His favourite thing is to chew up hard wood pieces, leaving a mess on the bottom of his cage. His toys are all leather strips with wood that he likes to chew on. I do not give him cotton ropes as he tried to injest them once. Hopefully you can find something that keeps your guy busy