Windsheer
Never make assumptions that people havn't got the job or have been laid off just because they write something negative about a Company.I am 39yrs old,have been flying since 1986 and have spent the last 14years actually flying the thing! Please don't take this as a personal attack on you as it's not meant to be,neither is it to deviate from the thread.I feel qualified to answer the Question simply because I worked for one of the above mentioned Airlines and I saw how the Cabin Crew were treated,particularly the ones on temporary contracts.Even some of the permanent Crew speak to the temps in an appalling way. It is literally like being in school again.
Whichever one she chooses they will be similar. Monarch would appear to offer the best combination of long haul/scheduled/charter but my advice would be to take the one that gives her the basing that she wants and whichever one she felt most comfortable with after her interview.
It can be a lot of fun and it will most certainly be a lot of work and it ain't the glamour job it's sometimes perceived as.
But as long as she's young and keeps poping the prozac and red bull for those long night flights she'll be fine........she might even enjoy it!