Hi there and
to the forums!
I'm sorry for the experience you had at the vet, but all is not yet lost
Although it's unfortunate that the vet didn't know what she was doing, eventually they'll moult back their flight feathers and be fully flighted again. Putting some extra perches would be a good idea to help them around their cage meanwhile! Rope perches are a good idea but be sure to watch them very carefully to ensure that they do not chew on them as ropes and ingested fibres can be very dangerous if left frayed.
Also, if you want to take your budgies outside, make sure you do so only when they are securely in their cages. Budgies should never be allowed to roam outside freely in any way. Not only are they very small and easily lost (even with clipped wings they can be carried off by a gust of wind or fall into a hole or gutter), they are prime target for predators like hawks with their bright colours, and could be poisoned by plants, chemicals, and other things present outside.
Your little ones are probably feeling a little confused right now with all the stress of the wing clipping. If needed, take a few steps back on taming and just go back to talking to them from the outside of the cage a lot, etc. for a few days until they are more comfortable. Always remember to go at their pace and only proceed when they're ready!
Meanwhile, come to the best possible place to learn even more about budgies!
To start, be sure to read through the forum's many Budgie Articles and "stickies" (threads "stuck" to the top of each subform for easy reference) to ensure you're up to date on all the best practices for budgie care!
If you have any questions after reading through everything, be sure to ask as we'd love to help
We look forward to seeing you and your budgies around the forums!