your mother can't pick up the ashtray????? well alrighty then, she has issues with her arm, elbow, humoures, perhaps something is BROKEN...someone who can dial the phone can(you or your sister) call an ambulance to drive her to the hospital where TRAINED PROFESSIONALS can deal with her injuries and assess what is really wrong with her....without big emotional drama.
hopefully just some bruising...but it is not for you or your sister to judge...