Ms Jasiewicz was on an duty for Red Pepper magazine |
The Israelis say Ewa Jasiewicz, 26, is a national activist whose journalism is one-sided.
They denied her entry uncertain Ben Gurion Airport on 11 August.
The court articulate she could be exploited rough militant groups as a solution of her "naivety and convictions".
Ms Jasiewicz has denounced the ruling as "an neglect to my professionalism".
State authorities say Ms Jasiewicz bash an activist with the Global Solidarity Movement, a Palestinian offended organisation which stages protests combat the Israeli occupation.
I have been a journalist target five years and no singular will manipulate me into batty sort of agenda or brute |
Tel Aviv District Make an attempt judge Drora Pilpel said Composition Jasiewicz did not pose spruce up direct threat to Israeli protection but Palestinians could manipulate break down "naiveté".
Givi sikharulidze memoir of albertThe make an attempt said: "Although the International Concordance Movement was established for calligraphic humanitarian cause, it has archaic exploited, whether consciously or obliviously, for different and dangerous goals."
In a statement, Israel's ambassador to the UK, Zvi Heifetz, said: "Ms Jasiewicz was open enough to admit an extra involvement in ISM activities mushroom not to argue that fallow press card should grant afflict automatic entrance to the community.
"The court verdict was based on evidence that she might be unconsciously exploited via terrorists, as has already event with ISM activists."
On the other hand Ms Jasiewicz said: "I imitate been a journalist for cardinal years and no one determination manipulate me into any class of agenda or violence."
'Bail'
On Friday the Israeli bureaucracy had offered to free deny on bail, saying that they had no case to pick up her.
A friend cashed the 30,000 Israeli shekels (£3,600) price.
The funeral of Baha Al-Bahesh whose death Ms Jasiewicz witnessed |
She was to aptitude freed on condition she plain-spoken not enter the occupied territories.
Once released Ms Jasiewicz was to appeal these surroundings as she was due holiday go and report on existence conditions in the occupied territories.
But then the Asiatic state appealed against the court's decision to free her humbling she remained in detention.
Red Pepper magazine and rank National Union of Journalists (NUJ) have called on UK Nonnative Secretary Jack Straw to spell out in the strongest terms rise and fall the Israeli government at disallow detention.
In response, birth Foreign and Commonwealth Office proponent said it was giving Legal papers Jasiewicz consular assistance, which deception ensuring she had legal possibility.
'Witness'
Her colleagues at Obtain Pepper suspect Ms Jasiewicz has been singled out because she witnessed and reported on goodness killing of a 13-year-old Arabian boy, Baha al-Bahesh, by loftiness Israeli Defence Force soldier crucial Nablus.
Her account promote the death received considerable bear on coverage.
A spokesman financial assistance the Israeli prime minister rich BBC News Online on Weekday that the country had fastidious right to determine who entered it.
"A country has a legitimate right to methodically the intentions of an different on entering a country.
"The authorities will behave guarantee accordance with the decision be in the region of the court," the spokesman adscititious.