If she is 2 months along, there is NO way to force an abortion/misscarriage without a) medical abortion or b) risking the mother's life. At this point in the pregnancy, the morning after pill or other medication will not work. Their options are pretty much limited. Yes there are posions that can cause misscarrage, but they also can cause the mother's death as well, and more often. a surgical abortion is the only "safe" way ("safe" as any surgery)
If they are sure of this, I would say have your friend and his girlfriend go to a planned parenthood clinic to get a test done and talk to a conseler about their options.
If she is also 14, her mother CANT kick her out without facing child abuse charges.
I know they arn't thinking of adoption- but make sure they know there are adoptive parents that would help support her even if her mother turns her back on her.
If she's just baseing this on the fact she's missed her period, it could be that she's not actualy pregnant but the stress of her life, and the fact she's so young, can cause missed periods all the time. She REALLLLY needs to get a test done before they make stupid choices. You can also buy pregnancy tests at Dollar Tree and Dollar General for $1 each. They are pretty reliable.