The woman's son currently goes to Esterhazy's PJ Gillen School in the province's southeast.
She told a bearpit session that the school was ranked second on the list to be repaired a few years ago.
She said there were some repairs with help from the community, but there are still leaky roofs and children can't drink from water fountains.
Now the school has been bumped down to 100th on the list for repairs.
Education Minister Don Morgan said all 28 school divisions are given funds each year for maintenance, but he added he will look into the school's condition.
The woman, identified only by her first name Jamie, is concerned about other schools in the province as well.
"My concern is all the schools from 1 to 99, what do they look like?" she asked the minister. "Because if our elementary school, K to 5, looks the way it does, what do the other schools in this province look like?
Note to readers: This is a corrected story. An earlier version said Don Morgan was advanced education minister