how can i get my sewing machine to work?

i have a crofton sewing machine md 8708.from aldi. it was working fine until i let someone use it that knows nothing about sewing. (big mistake i realize that now),i have no idea what she did. when i plug it in and press the pedal it makes noise like it is trying to work but nothing moves everything seems to be frozen. i have tried cleaning it out and oiling it, but it still will not move. when i try to put the pressure foot down it doesnt move, down or up. the balace wheel doesnt even move when i try to turn it. i dont see any thread or lint anywhere when i open it up. could the motor be bad? i have tried everything in the manual but none of the troubleshooting reflects my problem, if someone has an answer i would greatly appreciate it.