As far as taking birds outside, even a clipped bird can fly away if the wind picks them up. I used to take my bird outside when he was clipped as a baby, but then one day, something spooked him, and he took off, even though he was clipped! He flew about 20 feet, and I'm lucky he landed on a safe patch of grass. Those flight feathers might surprise you when they grow back in. I have a friend who lost a conure because the wings were clipped, but just a couple feathers grew back in, and that was enough for the bird to fly away. I would suggest trying a flight harness, and working on some recall training skills if you keep them flighted. Even a clipped bird will try to fly if something spooks them, and this could be dangerous because they might fall under your feet, into a drain, into a road, etc. It's best to use a harness for safety, clipped or not :]
There are good and bad arguments on both sides of the clip vs. no clip decision. Here are what I think are the pros and cons of clipping or not clipping:
Clipping pros: The bird will stay with you more, they're safe from dangers like flying into windows, mirrors, ceiling fans, other pets, flying out open doors/windows, and tons of other dangers. You'll always know where they are, since they can't fly off into another room.
Clipping cons: When a bird loses their "flight" they may choose "fight" when they are scared, which means they may be more aggressive. Every part of the bird's body is build around flight, including their metabolism - a clipped bird doesn't get as much exercise as flighted birds and may become overweight. Even a clipped bird may still try to fly if he's spooked, just because it's their instinct, and that may result in him falling and possibly breaking bones or blood feathers.
Flighted pros: Excellent exercise for the bird, great mental stimulation, and can allow them to escape from a situation the bird feels uncomfortable with. Lots of parrots really enjoy flying. My bird does laps around the room just for fun.
Flighted cons: Everything is dangerous. The bird can get into anything and you need to super bird-proof your house. It can also kind of be a pain to have a bird flying all over the house, especially when he decides to play "keep away"!
Both choices are good for your bird for different reasons, it's up to you. I choose to keep my bird flighted and I work on daily flight training (recalling, teaching him how to ascend/descend, etc) and he LOVES flying. It's great exercise and he's MUCH happier when he gets to fly a lot. I think that it's not a bad idea to clip a few feathers so that the bird can still glide, but can't really fly. They'll be able to fly a short distance so that they won't sink like a rock if they fall, because a severe clip can cause a bird to sink and break their keel bone.
My opinion would be to get a flight harness and keep her flighted. Flight training and recall is exciting for birds, but you do need regular training sessions to keep her in good shape. A great exercise is to get two people and a ladder (or a flight of stairs) - one person on top of the ladder and one at the bottom. Have the bird fly back and forth. Flying down will help the bird develop the precision and accuracy to descend - a lot of birds who fly away have no idea how to get back down, descending is one of the toughest flight skills. Flying up helps the bird develop muscle. Sometimes I put obstacles in the way so my bird has to learn to fly around things. It's fun!