I think you’ve done a pretty good job of holding the line. The main problem for me in these situations is the sight of that email in my inbox and the feeling that I’m being nagged. I’ve had very similar tenant situations, which had a similar trajectory — daily requests at first, then monthly, then eventually spreading out even more.
Here’s my two cents:
Tenants like this often take very good care of the property.
Many tenants have the attitude, “It can’t hurt to ask.” So they always ask. You just have to say no a lot.
As you’ve been doing, prioritize tasks that need attention according to your needs, not hers. i.e., safety, property value, etc. Many minor repairs can be deferred indefinitely without jeopardizing habitability.
Even if she has access to lawyers, most decent lawyers aren’t keen on filing frivolous lawsuits.
Try not to let it get to you. ; )
Don’t renew her lease if you really can’t stand it. Sometimes a steady rent check is worth the trade off of dealing with a tenant’s personality. Sometimes it just isn’t .
I truly feel your pain and wish you the best of luck!