There are two types of pans, with and without drainplugs. If you dont have a reain plug, use a large "cookie sheet" type catch pan and remove the remove the trans pan's perimeter bolts sothat one end will sag down and allow fluid to drain out. Remove the remaining bolts and pan, then the filter will come out.
You won't get all he fluid out as the converter will remain full. Not even most of the converters hae a drain.
olt everything back together, using a start in the middle(both sides) and work your way out pattern to tighten the bolts.
Really ought to look on You Tube there is a "How to" video in just about anything you can imagine.

Hope Lisa's Mom is doing well.
Corky