You are only able to care for one unrelated family at a time!! Make sure she follows this, as she could get in trouble for caring for more than one family at a time (unless the family is related to her)!!
This is from the State website below, this is the same in Hennepin County as well, not sure where the person below got their information. I was previously a Licensed Provider in Hennepin County before moving to Washington County.
http://www.revisor.leg.state.mn.us/arule/9502/0325.html
Subp. 3. Exclusion from licensure. Under Minnesota
Statutes, section 245A.03, the following day care situations are excluded from licensure under parts 9502.0315 to 9502.0445:
A. day care provided by a relative to only related
children; or
B. day care provided to children from a single,
unrelated family, for any length of time; or
C. day care provided for a cumulative total of less
than 30 days in any 12-month period; or
D. the exclusions contained in items A and B are
mutually exclusive.