No, she does not need to make up what she has already performed when she was a Sunni. All worships performed according to her previous sect does not need to be repeated.
If you are sure that you did miss an obligatory Prayer or an obligatory fasting, then you should make it up and Qadha. If you are not sure that you missed any obligatory Prayer or fasting, then it is not obligatory on you to keep Qadha.
Kaffara can be paid any time but with out negligence. Kaffara of deliberately not fasting a day of month of Ramadan is feeding sixty poor believers or fasting two months. If you could not fast due to health reasons, you need to pay Fidyah not Kaffara. Fidyah is feeding one poor believer for every day.
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