Welcome to JustAnswer.
The good news is that the ingredients listed are not toxic per say. I would be more scared if possible:
A digestive obstruction (stomach or bowel)from the toilet paper.
Pancreatitis from the amount of food she ingested.
A stomach dilatation from the food and the rid-x she ingested.
If this has happened several hours earlier, there is no point to make her vomit.You may need to wait and see if symptoms persist.
If I get it right, rid-X is the stuff you put in the septic tank?
There are a lot of bacteria. Their website mentioned humans should not be affected by it.
Due to the amount she ate, I wonder if she could get some serious digestive upset.
I would suggest before you get her to the ER,
Stop feeding her for a day.
Give her water if no vomiting.
Call the ASPCA centre to know if the amount (possibly just give them a possible amount) would be detrimental to her.
They do charge you, but it is worth the call.