Her father tried to visit her there but was repeatedly denied access by the guards, who also prevented him from calling his daughter, Ratcliffe said.
She was arrested in April 2016 at a Tehran airport as she headed back to Britain with her daughter after a family visit and was sentenced to five years in jail after being convicted of plotting to overthrow Iran's clerical establishment.
A project manager with the Thomson Reuters Foundation, the media group's philanthropic arm, she denies all charges.
"The foreign minister of Iran, Foreign Minister Zarif said that he'd not discussed with the British a swap between the United Kingdom and Iran over the oil tanker and Nazanin, which are odd comments but they were played out for a couple of days", Ratcliffe said.
British officials urged Iranian officials to let her have immediate contact with her family and said her treatment has violated all global norms.
"Jail is getting extra hard and extra hard for me".
She was arrested in April 2016 as she was leaving Iran after taking her then 22-month-old daughter Gabriella to visit her family.
I hate being played in the middle of a political game.
"Hopefully her transfer to hospital means that she is getting treatment and care, despite my distrust of just what pressures can happen behind closed doors".More news: Another Royal Caribbean Ship Skips Puerto Rico Call Due To Protests
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She was not given assurances as to contact with her family and was forced to wear handcuffs in hospital despite demanding otherwise. "It is unnerving when we don't know what is going on".
The Prime Minister's official spokesman also told a Westminster briefing: "We are extremely concerned about Nazanin's welfare and call for her immediate release, and we urge Iran to allow family members to visit her and check on her care".
In March, U.K.'s foreign minister announced that Zaghari-Ratcliffe would receive diplomatic protection, representing recognition by the British government that her treatment is unjust and illegal.
The couple's five-three hundred and sixty five days-extinct daughter, Gabriella, has stayed in Iran along with her grandparents since her mother's arrest.
Ellie Kennedy, Amnesty International UK's individuals at risk campaigner, said: "Yet again, the fear must be that the Iranian authorities are playing games with Nazanin's health and wellbeing".
"And sometimes using prisoners as pawns in political battles".
Speaking in the House of Commons, Ms Siddiq said Mrs Zaghari-Ratcliffe's family have no idea how she is being treated following the transfer.
"We can proceed to name for her free up at the excellent ranges".
"We are in regular contact with Mrs Zaghari-Ratcliffe's husband and our Embassy in Tehran has consistently requested consular access".