Review your state laws and consult with an attorney.
See e.g. Fair Housing Law
http://www.dwd.state.wi.us/dwd/publications/23a6/ERD9523-PWEB.pdf
It is unlawful to discriminate against a person in housing, even in part, because of that person’s protected class.
WHAT ARE EXAMPLES OF DISCRIMINATION?
· Refusing to rent or negotiate with someone for the rental or sale of a dwelling.
· Failing to renew a lease or lying about the availability of a dwelling.
Family status is a protected class and includes any household with minor children. A person who is pregnant or seeking custody of a child, or is planning adoption or guardianship is included.
It doesn't appear that you are allowed to discriminate against your tenant because she may be planning to become a foster parent. Consult an attorney in your area.
What does the LEASE say about loud noise, disturbances, or the quiet enjoyment of others? Did you put anything in the lease to protect yourself from noisy tenants that interfere with YOUR quiet enjoyment of your own unit? Having three children live above you might be disquieting, but again, you have to be careful not to voice any discriminatory animus towards your renter.
What about nonpayment of rent? Does your LEASE provide that time is of the essense? Have you accepted late rent payments in the past? Does your LEASE have a non-waiver clause?
Are you aware of the summary eviction laws in your jurisdiction for nonpayment of rent? Perhaps you can have an attorney write your tenant a letter acknowledging her recent conversation with you (re: unemployment for the entire summer) and reminding her that despite the financial difficulties that she expects to face this summer, that timely payment of rent is an essential term of the lease.
If your tenant fails to pay rent on time--at least she has been warned in writing that you will not waive the timely payment of rent to accommodate her unemployed status (basically, this isn't your problem--she has to pay her rent whether she works or not)--and you can efficiently evict her from the premises through a summary proceeding. Again, read the laws on summary eviction and consult a lawyer:
http://wis-law.com/tenant.html
http://wis-law.com/tenanttermination.html
http://wis-law.com/tenant704.html#anchor3275933
The law must be followed exactly; no deviation allowed. It is a recipe, so to speak, and if you fail to follow the recipe as set forth in the statutes, you LOSE and subject yourself to wrongful termination claims.
Be careful NOT to express any discriminatory animus toward her "family status," e.g., plans to become a foster mother because something like that could cause problems for you under state fair housing laws. Again, consult your laws and an attorney.