The MP for the area, Tom Elliott, said it would be "more appropriate" if she had remained in the South American country to finish her parole.
"She served her time in prison but people will be asking was that enough and does it fit the crime?" he asked.
"I would have thought that if it was part of her conditions that she had to remain in Peru, then it would be more appropriate to remain there at this stage and it would have been seen as better justice.
"There will be a mixed reaction with her arriving home.
"Friends and family may probably be pleased to see her coming back whereas others will say it's a pretty serious crime, she should have done the full sentence. A lot of people could have been seriously damaged and had their health seriously damaged if she would have pursued with that crime."
McCollum arrived in Dublin at around 8.30pm on Saturday.
She walked through the arrivals area alone but did not talk to the waiting press as she dragged two suitcases behind her.
She remained outside for several minutes for family members.
When asked where she had planned to go by reporters, she replied: "Home."
However, hours before she landed in Dublin, the former dancer posted pictures on Instagram as she prepared for her long journey home.
Wearing a black vest top and black jeans, Michaella was greeted by two females before making her way back to Dungannon where she was met by other family members.
McCollum and Reid - nicknamed the Peru Two - were working in Ibiza for the summer when they travelled to South America three years ago. They were arrested as they attempted to smuggle the cocaine in their suitcases. However, they denied knowing the luggage contained drugs, claiming they had been kidnapped and forced to become drug runners.
They later admitted the offence and were jailed for six years and eight months.
In June, McCollum was criticised after being pictured living it up in the capital Lima with fellow cocaine smuggler Kaouthar Essafi, who she befriended in prison.
Following her release from prison, she was spotted partying in nightclubs and dining out at plush restaurants, despite agreeing to do charity work while living with a local priest.