What Causes Right Eye To Be Blood Shot?

My 48 yr old mother who is 24 days post op, had a blood clot in right leg 3 days post op. They found out she was severly anemic, had to get a blood transfusion, and is now on warfarin tablets. her laproscopic incisions are free of infection, and healing well. She is now having symptoms of dizzyiness, headache, nausea which have diminished, but now her right eye is blood shot from the inner corner of her eye, it appears a cloudy red. She does not know if she should go to the ER or just wait until the morning to see the family doctor.