Having had cats my whole life, all my indoor-only cats wouldn't (won't) go
outside if you pay them.

Just keep her inside. Take her out briefly to show her where the door is. If
she gets out, more than likely she'll plaster herself to the door trying to
get back in.
That's what mine do, anyway.  :p

If you get her to like being outside, it will be cruel to keep her in all the
time. Don't let her learn to like it if you don't plan on letting her go
outside, either supervised or not. I have one girl who likes to go out and
she's miserable if we don't go for our daily walks (inclement weather the
usual cause of that). Being in the States in a busy area, she's only allowed
out on harness with me. But it's quite obviously the highlight of her day.
She's been going out on harness since she was 8 weeks old.

The other two, who have never been outside other than on my balcony and to go
to the vet, get VERY upset if I try to take them downstairs. They bee-line
back for the door and cry to go back in.

If you DO bring her out, and she learns to like it, be prepared to be letting
her out to deal with all the dangers of the outdoors (which depending on
where you live might be minor or major). You might find yourself going out
and getting hit in the a.s with snowballs so your cat stays happy, if you're
anything like me. *LOL*
And whatever you do, if she goes out, check your car hood and behind your car
before you start it/leave. I've read about tragedies where the family cat was
killed because it crawled into the car engine to warm up or was sitting in
its own driveway as the car backed up. Actually, if your neighbors let their
cats out, do this as a matter of course.

Anyway, good luck.