Hell even the walk to the Kitchen to use the phone or accidently hitting the phone list and recall last number option on a digital dialer and seeing a suspect number on her phone is PC these days.
Polite questions like "may I have a drink of water" or "may I use your phone" and or "restroom " during a seemingly innocent visit is just a tool of the FLEA/LEO investigators.
Once inside they were looking at her book shelves, mail laying on a coffee table, todo notes on the fridge, number of dishes in the sink or on the table and asking questions based on what they saw and didn't see to validate a telephone and or paper warrant.
Stay Safe , say no at the door and if they have anything valid they wouldn't ask, they would just come in while giving you a nice paper cut across the forehead with said warrant.
You watch Law and Order don't you? ;-)
No to all four questions.