Go to the BBC jobs page- they have lots of placements and she can apply online. Most are 2-4 weeks over the summer but they vary. I would advise her to go for one that nobody else is going to go for! Eg- world service above BBC comedy, so she stands a better chance. Also I would directly contact the production company that makes her favourite programmes such as Talkback etc. They all have websites, so she could enquire online first and then send in an application form. If really stuck, she could write to a producer of a programme she loves and offer her services over the summer. If she writes enough letters, she is bound to get something!!