hello... as you say blood shot eyes...it may be actual blood in subconjunctival area due to injury
or dur to high blood pressure
or it may be conjunctival congestion.
does she have discharge in eyes...if so its conjunctivitis
...we can start her on antibiotic eye drops like moxifloxacin
4-6 times a day. see for a week..if it reduces then fine or else consult eye specialist.
but if she has no other eye complains and only blood shot eyes...kindly take her to physician and check her blood pressure..old people are prone to high b.p