She also apparently works out or at least exercises so she must be in decent shape. She assaulted a deputy enough to require treatment in a hospital.bbm
I indicated a "bag or a suitcase". The bag could have been a military duffle bag, which will easily hold 100+ lbs. No need to use the strapping to carry it, just cradle the bag to lift and move. It is quite possible AS had one or more duffle bags in the house.
LS does not appear to be 'frail' in any sense of the word. In fact, she appears somewhat 'stocky'. I have no doubt LS could lift and place 90 lbs. Maybe not 'easily', but I believe she could do it.
Airline weight limits have no relevance in this case.
I do think she is capable of lifting or dragging 100 pounds without too much trouble. Jmo