My mother has an eye infection i am assuming?

My mom is 82..she had numerous health problems including glaucoma. I gave her drop saturday morning as usual. Her eyes were fine...in the afternoon she said they bothered her..when i looked at them there was no whites to her eyes all blood shot..i figured the shampoo that i had used irritated them earlier..(i use the same shampoo all the time..not a new one) By saturday night there was pus coming out of them and stuck shut...i bought saline and washed them out..today being a holiday i called the eye drs emergency and they gave me an anitbiotic drop..i started them this morning but it doesn't look ANY better at all. They are getting "stuck" shut with slimy stuff.

Should the antibiotic have started to work by now?...Could it be something more serious?..i figured if it was just one eye ti could have been a bleed or something behind the eye but it's both eyes and it does look like the pics online of conjunctivitis.. I am taking her first thing in the morning to the eye dr but how worried should i be that this is something more serious?..thanks!