Absolutely she can be terminated for be being too slow. An employer gets to choose who it wants to hire and keep. If your daughter is too slow, she needs to hurry up, or find a job that she will do better in.
As a union member she has certain rights, but rarely will a union jump in where a new employee is being terminated for being too slow.
Good luck to you and to her.
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Yes she can be terminated. In a sense, probationary periods are part of the selection and testing process. Unfortunately, by being too slow she isn't meeting her employers expectations, as far as job performance and can be lot go...
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Based on the info provided, she generally can be terminated for being too slow. Even though there is a union, many of the protections provided by collective bargaining agreements do not extend to probationary employees. You could have an attorney review the agreement to evaluate whether your daughter is protected.