The most common causes of red eyes and discharge in older dogs include:
The treatment depends on the specific cause and can include eye drops or ointment for simple conjunctivitis, artificial tears or drugs that stimulate tear production for dry eye and drugs to reduce the pressure in the eye for glaucoma.
Diagnosing the specific cause requires an examination and diagnostic tests. Tests can include staining the cornea to see if there are ulcers, checking the pressure in the eye with a tonometer. This is the same instrument used to test humans for glaucoma.
It would be good to get your girl to the vet as soon as possible. Since the problem has been evident for a week, waiting until normal hours on Monday is reasonable.
Let me know if you have follow up questions.
I found Eye East on the web. It contains goldenseal, rosemary, eye bright and chamomile. The website I checked did not indicate what liquid is used. Most eye drops use sterile normal saline. The product should be safe and will help lubricate the eye. It is a reasonable first try at treatment.
I do not know if Eye Easy is more effective than liquid tears or saline eye drops, which are probably less expensive. A plain eye ointment, which should be available over the counter, would leave a film for longer than eye drops and might help sooth for longer. Using drops every few hours during the day and an ointment at night would help ease the irritation of simple conjunctivitis and dry eye.
Cloudy eyes can be caused by cataracts. Cloudy eyes can also be caused by changes in the refractivity of the eye result in reflected light giving a hazy look to the eye. Both are common in older dogs.
Ticks on the eyelids don't usually cause red eye although a tick transmitted infection might. Most of the tick borne diseases (Lyme, Ehrlichia, Anaplasma, Rocky Mountain spotted fever, etc.) have other signs and symptoms.
I hope at home treatment works. I understand the concern about additional trips and costs of veterinary care.