if your Pakistani girl friend is hindu , sikh , Buddhist , jain , parsis , Christian she can apply for grant of initial LTV for a period of 5 years at a time,
2)she can also apply for tourist visa to india
3). A visit visa can only be granted to a Pakistani national who does not have a resident or occupation in India and whose sole objective of visiting India is recreation, sightseeing, casual visit to meet friends and relatives etc. No other activity is permissible on a visit visa. A visit may be issued normally six months with multiple entries and is non extendible and non convertible. The duration of the visa is the sole discretion of the Authority.
4) if you marry the pakistani national then she can apply to convert the tourist visa to X visa