[thisisforyou]

Taking for granted most of the other answers here ('make sure she has tried and likes coding' et c.): Have her look up reviews of the program on https://www.coursereport.com/ and www.switchup.org. Have her visit local meetups and conferences, there will surely be students/grads there that she can talk to and can get eyewitness reports from. Have her ask around to disinterested third parties that have had contact with the program and see what their appraisal of the program is. Have her contact the program and see if they will provide contacts to grads that she can talk to (while they may be biased, a 'yes' is much better that a 'no'). (Full disclosure: I went to a bootcamp and got a good job very soon afterwards which I have had for a year. True, some programs are shady, but these seem to shut down quickly. A bit of research seems like all that needs to be done to make a decision and if it works for her there is no reason to worry.)