Ms Edith Hemmingway, the Headmistress of the school in 1905, introduced a further aspect of school life into MGS with the formation of the boarding school. It was an unpretentious attempt to house the girls on the school premises and they were put in a room below the regular day school. They remained there until Holt Hall was ready to house them in March 1911.

The hall was named after the secretary of the New England Branch of the Women's Foreign Mission Society, Miss Mary Holt. This was done in appreciation of the fact that she had been instrumental in getting part of the money donated by Mr. Fairchild of Massachusetts, America. He had donated $15,000 in gold to Mission work in Malaya. Due to the efforts of Miss Mary Holt, $5,000 was allocated for a Boarding School in Kuala Lumpur. The hostel was housed in Holt Hall until 1935 when they moved to a large house on Petaling Hill loaned by Mrs. Loke Yew.

In March 1936, the hostel was moved yet again to a country side estate which was achieved through the generosity of Mrs Loke Yew. The hostel was called Country-Side Estate and it was large enough to accommodate 90 girls. It was a building of scenic interest and it had an apartment on one floor for the Superintendent and her assistant.

The school hours were from 9.00 a.m. to 12 noon and from 1 p.m. to 3 p.m.. In 1914, Miss Ada Wagey was sent out to take charge of the Boarding School. Ms Wagey faced a number of problems as a result of her neighbours' chickens. These birds repeatedly were found on the Boarding School premises and one Friday night, Miss Wagey saw two of them on the dining table gobbling the rice meant for the girls!
For Miss Wagey, this was the last straw that literally broke the camel's back! She could not control her temper and reacted by grabbing the fowls, wringing their necks and throwing them over the fence!

Coincidentally, or otherwise, that night, November 14, 1914, at 3 a.m. there were cries of "Fire! Fire!". One of the girls had awakened to find the school on fire. There was no way of contacting the Fire Department as it was discovered that the telephone lines were cut. Miss Dade, one of the teachers rushed over to the Railway Station to telephone the Fire Department. The firemen arrived and fought the fire. However, very little of the furniture of the school was salvaged. Only the screens and the seats of the lower floor remained intact.