V.
R.,
i think you should do an extensive background check on the sitter.
ask for references and call on those people (ask questions such as does she miss a lot of work, is she late, has she cooked for kids, what kinds of stuff, is she CPR certified. . .)
if iw ere to get an in home care and not be in the house i'd consider getting a nanycam, just in case
good luck
V.