Guru Gobind Singh Indraprastha University Delhi Answered Questions

Please visit this link:
http://blog.entranceexamcds.com/entrance-exams/engineering/ipu-cet-guru-gobind-singh-indraprastha-university-common-entrance-test-2017
There, you can know more about GGSIPU eligibility, application form, selection process, etc.

The Cutoff of IPU CET 2017 will be announced by its exam conducting authority - Guru Gobind Singh Indraprashtha University (GGSIPU) after the test is over. Candidates will be offered admission in undergraduate engineering programmes at the university and affiliated colleges on the basis on IPU CET cutoff 2017. After considering various factors like difficulty level of the exam of IPU CET 2017, number of test takers and available seats, GGSIPU and its participating institutes will release IPU CET 2017 cutoff lists for the candidates.

Hi,
Kindly check last year's cut-off on this link for colleges under IP University. With this, you can get an idea of the colleges your sister might get:
https://www.shiksha.com/university/guru-gobind-singh-indraprastha-university-delhi-24725/cutoff

Not really. Rank doesn't really matter when it comes to Indian institutions. Unless you're in an IIT or NIT or NSIT or DTU etc., everything else doesn't really make much of a difference.
Coming to IP university, it may be a Grade A university, but its position with respect to elite institutions in India is questionable. There are some respectable Engineering colleges in IP. But, if you hear from their students, everyone will have some complaint or the other.
What really matters is the kind of job opportunities your field has to offer at the end of your studies. College may play some role, but it is usually your own hard work and effort that will make a difference. Rankings are just a waste of time.

Amity is better than IPU in terms of faculty and infrastructure.
But it will be difficult to get good job placement after B.Com. So, I would suggest you study further and do some extra course like MBA finance, CA or CS or M.Com to get good jobs. Amity is definitely better in terms of placements.