I don't show cats but just wanted to wish you good luck with Maisie? What breed is she?
You never really know whether a cat will be a good show cat until you try it out so I'd advise looking for a show near you at the right time and get her entered. Then you can see if you both enjoy it. If she's a pedigree then it would be best to check with her breeder that they are happy with her being shown (most breeders don't like poor examples of their breed appearing on the show bench) and s/he will also be able to offer you advice. If she's a non pedigree then she just needs to be in good health and up to date with vaccinations.
It's a long day at a show and the cats have to be in their pens by around 9am and have to stay there until the show closes at approx 5pm. So a show cat needs to be ok confined in a small space for all that time. They also need to be comfortable being handled by lots of strangers - how does Maisie react when you have visitors? Is she happy to be handled by them?
If you're showing at a GCCF show you will need a GCCF show kit as everything in the pen will need to be white (white blanket, white litter tray, food bowl etc). When you arrive at the show early in the morning you need to go through the vetting in procedure where a vet checks your cat for fleas etc and any obvious signs of ill health. You'll need to take along a vet certificate to prove she's up to date with vaccinations. Once you've got her settled in her pen you will have to leave the hall for several hours while the judging gets underway. This is aimed at it all being anonymous and the judges not knowing who owns which cat (not sure that really works - I think judges get to know the cats anyway). It's in the GCCF rules that you aren't allowed to advertise your presence at a show, so if you do enter her into a GCCF show you will need to be careful about telling people! At GCCF shows the judges go around the pens and judge them there rather than in rings or on stage, the exception to this being the Supreme show which is a bit different. You'll be able to return to the hall about midday when the public will be allowed in also. Your cat will still need to stay there until the end of the day, even if she's not being judged in any further classes.
In FIFe shows you don't have to leave the hall, the show kit doesn't have to be all white and you present your own cat to the judge and watch it being judged. When your cat's number is called you take your cat up to the judge. I imagine you have to go through the same vetting in procedure as at a GCCF show. I dont' know how TICA works.
But as I said - the only way to find out if you enjoy it is to try it.