Thanks for your question.
She will need to apply for an EEA Family Permit before she travels to the UK. She will need to complete VAF5 - EEA Family Permit which is available for download from the UKBA visas website. She will need to send the form to the British Embassy or a visa application centre if they have them in Israel.
She will have to submit he passport or travel document along with a passport size size photographs and the relevant supporting documents to her application.
She would have to send documentary proof of you (eg. certified copy of your passport), proof of her relationship with you (eg. marriage certificate, correspondence, evidence that you have been living together, basically proof that it is not a sham marriage) and a letter from her wit the application stating the plans you have, that she is intending on traveling with you for the duration of your stay in the UK.
She will be able to work in the UK on a family permit.
She should not come merely on a visitor's visa and then apply from the UK as this implies an element of dishonesty about being a visitor and could complicate matters.
The UKBA states they aim get all application decided upon within three months, but it really depends on how busy the application centre is at the time of submission.
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