Quilt2005

Hi, my mother has a Millennium. She just connected the additional iPad accessory (someone did this for her). She used it for about an hour. The thread cutter wouldn't work. She reset something, then couldn't get it to stop cutting. Machine sat for about a year with no use. She went to use it the other day & it smelled very hot. She checked some basics, tried again with same smell & it started smoking. Any ideas on what I could check?