Spay and get her chipped while under the GA (one of mine was done before neutering, I was in tears because he was screaming his head off, it was obviously very painful for him) My vet offers a discount on the chip if done while neutering as they hate chipping while not sedated.
The pyometra risk should be enough for anyone who isn't a professional breeder to spay thier girls, it's just not worth the risk. So many cats die from pyo because it wasn't obvious soon enough to save them.
Your not a professional breeder, if you love your cat you'll spay her. She doesn't need to have the stress of a pregnancy/rearing a litter and breeding can change thier temprement, she might not be lovely afterwards, also her being an affectionate cat doesn't mean she'll be a good mum at all and allowing her to get pregnant means risking her life or putting her through a c section of the birth doesn't go well.
Spaying before thier first season lowers cancer risk/no risk of pyo and she won't turn into a crying/spraying/infuriating harlot possibly every 2 weeks (yep if they don't mate they can come back into season 2 weeks later, over and over again!) from her first season until she's mated.
Have you been around a female in heat? They are a nightmare, they yowl constantly, won't leave you or visitors or even teddies alone, they rub thier back end against anything hoping for a humping, they can start spraying thier pee everywhere to attract a mate and they will do anything to escape, it's next to impossible to keep them in and to keep the toms out. The local toms will spray all over the outside of your house too, it absolutely reeks and you can't wash the smell off, you have to wait for it to fade which takes forever!
You won't be able to open your windows/doors in the summer! Mine are all neutered but I had to keep one of my girls in earlier this year when she started having seizures, summer was horrendous, the kids couldn't play out freely as we had to watch the doors, the house was unbearable hot/stuffy and got a musty smell because there was no fresh air getting in. She still managed to escape a few times, we were extremely careful and she wasn't even full of hormones and desperate for a quickie with the local boys, a queen in heat is alot harder to keep contained than a poorly cat.