There is a ton of stuff on the Internet. Just Google IELTS. There is an IELTS site that tells you what the markers are looking for and you can train her towards the goals they set.
It is really important that she learn the details, especially in the writing. They are so picky and 6.5 is hard to get unless she is an advanced student already.
There are some good books - just check at Amazon. I used four or five and they all had different helpful tips. You might find some at your library or ask them to order one or two.
You can take a practice test on line. I would do as many as you can so she gets to know the format of the test. There are also practice tests in the back of the books. Timing is really important.
Start taking the listening tests by having her read the script and then listening to the tape and finally answering the questions. There is a pattern to the listening stories if you can find it. On the test itself, have her read the answers quickly before the tape starts or after she has answered a question, read the answers to the next question, because they will give her clues of the words she will hear.
Buy or get her to buy a Thesaurus because there is a great deal of word substitution in both the listening and writing. She will need to use as many versions of the words as she can, so it is good to memorize that book, back to front. They usually have them in the dollar stores.
There is some advice in other posts on Dave's. Just go to the search button above and type in IELTS.
Here is one contact:
https://www.teachers.cambridgeesol.org/ ... orteachers