The "Orlando trip" IF IT HAPPENS is to renew her visa without having to go through Canada's customs. She's afraid to go back to Canada cus all the shit waiting for her there, and she literally has nothing. To add to it, if she goes to Canada without Salah he might say "you are home now stay with your mother" and not have her back. If she goes to the US he has to let her "come home" to him.
Secondarily she's probably worried about the over stayed Visa as is and thinks that if she gets a different stamp on her passport they wont notice when she goes to leave or come back.
Going anywhere else in the UAE would just be a "border run" and all her lies would be obvious, she has no special visa etc. She cant go anywhere "exotic" without Salah, but the US, specially Disney, will be accommodating of her issues.
Final note, why would Salah, the absolute LOVER of the west, not want to go to fucking Disney world, or the USA in general? The frangrance empire cant run while he takes a holiday? Chantal will already be paying for the hotel, his meals are minimal, and he made BANK during Ramadan in sales. Emirates flights are cheap to Orlando. And dont forget all the loving family who can easily take care of Julia, the worlds greatest totally domestic not from the streets cat and Harry who just sits on a bookshelf.