Tenant refuses to clean after her dog :(

[Carol H.]

I bought a house and rent out a few rooms. One of my roommate/tenant always let her dog poops in the backyard without cleaning after. After I tried to communicate with her, she only agrees to get a monthly scooper service, which is totally unacceptable to me. She is a troublesome tenant and I would like to kick her out if possible, however this is the only first month of her 9 months lease.

In the lease we signed, it does says "It is the tenant's responsibility to clean up and dispose of pet excrement anywhere on the property and on adjacent sidewalks, streets, alleys and neighbors' properties."  However, she is arguing it does not say she has to pick it up every day. :( 

Any advice to deal with this situation without lengthy eviction process? I totally want to kick her out, but I just don't want to go through the painful process.