What type of toileting device would the Queen use?

The Royal Throne.

This is none of your business. You have an infantile, immature need to know other people's lavatory habits.

None of us knows. Why don't you write the Queen and ask her? Her ladies-in-waiting will know how to deal with trolls.

Same as any one else, although clearly not a potty like yourself.

That would be called a "toilet".

The same as anyone else troll

Probably a Royal Flush!