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If she has a specific job/employer in mind, then they may have childcare that they offer as part of the package.
My advice, however, would be as a single parent, it will be extremely difficult to be away from family support - if you use group care, then if your child is sick, you must take time off work. The employer may or not pay for absences when a child is sick, they will certainly pressure your sister about being at work every day, and it's very stressful for everyone.
However, if she is moving to Zurich where she will have family/friends to help out, then it may be possible to hold down a job and have a child in group care.