What should I do with my Burmese maid's work permit when she resigns?

Edit—-

It is Blue book work permit.

Maid said she will need employment cancellation letter either from us or she will get it by herself when she gets new job.

But what i understand is new job = new work permit... why does she has to use this work permit to apply new job?

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Shall i keep Burmese maid work permit with my husband name as employer when she resign maid work?

Or she should keep it?

It valid until next year March and she said she has to keep it but my husband cancel her as employee with copy of her WP.

Is it so?

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