"The funds are coming," Sister Joan of Arc, head of the children's shelter in Kolkata, told CNN. "We can feed every hungry mouth every day. It's the miracle of love." Questions about funds are often met with a similar response
That doesn't satisfy the critics. As a registered charity operating in over a 100 countries, they say there needs to be some accountability, as there is with groups such as The Red Cross or Oxfam.
"Why is this organization not being held to the same standard?" asks Gonzalez. "They get a free pass because of religion; they get a free pass because of the influence of the Vatican."
Mother Teresa's dogmatic views on abortions, contraception and divorce may have been welcomed by the socially restrained Vatican, but they have also been criticized in more progressive circles and put her at odds with the feminist movement.
She raised some eyebrows when, during her Nobel Peace Prize Lecture
after winning the prize in 1979, she said the "greatest destroyer of peace is abortion."
Additionally, some critics accuse Mother Teresa of trying to convert those she served to Christianity
This is something the Missionaries of Charity firmly rejects. "She looked after everybody in the same spirit, whether they were Muslim or Hindu or Sikh," says Kumar, who herself is Hindu and Sikh.
"When I used to go pray with her, she would say 'Sunita, come to the chapel and you sit the way you do for your prayers and I'll sit the way I do and we'll say our prayers,'" she says.
Even her path to sainthood has been controversial.
To become a saint, Pope Francis had to approve two miracles. One of them involved a rural woman, Monica Besra, who claims she was cured of cancer after praying to Mother Teresa.
Monica says she was cured by Mother Teresa's blessings and not by doctor's treatment.
"I took doctors' medicines, threw up and was in a lot of pain. But when I prayed to Mother Teresa from my heart, Mother Teresa blessed me and now I am healthy," she told CNN. "My entire village and I am very happy that she is being made a saint."
However, critics dispute this version of events — they say it was modern medicine and not a miracle
that healed her. And some doctors claim her tumor was a cyst caused by tuberculosis
, rather than a cancerous tumor.
"Our organization does not believe in any kind of miracle," Prabir Ghosh, General Secretary of Science and Rationalists' Association of India, told CNN.
According to Ghosh, Monica Besra's husband said as much to him in 2003. Ghosh told CNN that he has him on video saying his wife was cured by medicine, rather than Mother Teresa.
In an interview with TIME magazine in 2002
, Besra's husband also challenged the Vatican's claim. "It is much ado about nothing," he told TIME. "My wife was cured by the doctors and not by any miracle."
However, Besra has since denied these statements. This week, he told CNN he stands by Mother Teresa's miracle and never made the comments to TIME.
Museum of poverty, or place of service?
As these controversies rage on, life inside Mother Teresa's homes carries on as usual, with the same simplicity and routine that's been in place for decades.
According to Gonzalez, it's a "museum of poverty." To some, it's a place of selfless service.
A group of nuns will travel to the Vatican for the canonization ceremony in September, and those who remain in Kolkata will mark the day with prayers of thanks.
For them and other devout followers around the world, Mother Teresa was and will forever be, a saint, and no amount of controversy can change that.