Based on your two answers so far, and the fact that she wees everywhere, first thing I would do is go back to complete basics with the toilet training like you would a puppy and start over again to re-enforce the right and only place is outside, but more importantly make it a positive thing rather then a negative thing, she is going to get told off over. Take her out regularly and after eating playing and sleeping, when she starts use a word of choice in a happy encouraging voice, she will associated that word eventually with toileting and you should later be able to use it as a toilet cue word. When shes finished lots of praise and a couple of treats.
If she has an accident don't tell her off, don't get angry or stressed she will pick up on your tone of voice and body language even if you don't tell her off. Any accidents just clean up with a special pet stain odour remover.
I would also start to give her wind down activities and periods away from you when you are in. Have you somewhere to do this other then the conservatory that has easy clean floors as she may well have a bad association with the conservatory and be better elsewhere. If you can use the kitchen, I would use a baby gate to separate her,
dogs sometimes do better with a baby or dog control gate as its not so isolating as having a solid closed door shut on them.
The best time to start is after she has had a good walk or play session when usually they are more tired and ready to settle. I know she has toys and lots of them, but a pile of inanimate toys just left laying around soon become boring and are no substitute for the access and company they crave and cant do without.
Does she ever have chews or kongs. Kongs are hard rubber hollow toys the kong classic you can fill with wet food and all manner of things the wobbler you can fill with kibble. These are interactive and rewarding and those or chews are a good thing to start leaving them with when you begin the training.
Other things that can help stressed anxious dogs are putting an old t shirt or jumper in their beds so they still have your smell, some like a soft toy too, leaving a radio on can help rather then leaving them in silence on a talking station as the sounds of voices can be comforting. It may be worth investing in an adaptil plug in diffuser what these are and how they can help are on the link.
http://www.adaptil.com/uk
Stressed anxious dogs are usually not to receptive to retraining so something like zyklene or kalm aid may help too again details on the links.
http://www.zylkenepet.co.uk/
https://nutri-science.net/kalmaid-for-small-animals/
Ideas for kong fillings to are on the link below
http://www.kongstuffing.com/
What you need to do is start when you are in, and after a walk or play session, take her to the area, and leave her with a kong or chew, it provides self amusement and also makes a good association with being left. No good byes no fuss just leave. You will need to return before she starts to get really stressed. Even if its for literally minutes let her out but ignore her for a further minute or two then call her and give her lots or praise and a fuss. You then build up these times in very small increments of time while you are in and make it normal by doing so. You then start to keep the same routine when you do go out or visitors come.
There are other things you can do but its likely not a good idea to give you too much to do at once. Other suggestions would be to crate train which again will take time and work
but may help. You will also have to work on her behaviour when visitors are coming too to get her over the issues that causes.