I need advice *warning huge rant follows*

Well I got home all ready to broach the subject with her but as it turned out while I'd been at work DH had already dealt with the issue in his own way and MIL had been made to clean up the lawn. 

So after stewing and stressing about it all day I just left it for now and didn't give her the letter.  I did mention it to her and told her that I thought it was unhygienic and unsafe for Michaela (which she disagreed with), I also said that birds don't even eat meat (which she also disagreed with) and then told her that we could get kicked out if the landlords saw it and she said fair enough so here's hoping that's an end to that.