well, when i had braces, it was very awkward to swallow, and took a while to adjust to. esp. when they did something new, and stuff started adjusting again. that could be why she's feeling like she's having probs swallowing. i'd just give it a few days or a week and see if she's still having probs, then go and ask the orthodontist. as for the talking, it took me a few days to get used to it. about a week when they adjusted and pulled teeth.
p.s.- no, she won't set alarms off, but if you want to freak her out get her one of those new tooth brushes from wal mart that play music and just unwrap it and don't tell her ha ha.