First thing is trip to the vet. Make sure she has no health issues.
Second thing is schedule. Get some structure in her day so she knows what to expect. Actually write out a schedule for the house and stick to it. Include in it plenty of time to eliminate outside (every 4 hrs potty breaks at least).
Third thing is going back to basics. Act like she is a new dog in the home. Be consistent, Give her some boundaries and make sure you do obedience training sessions every day. Restrict access in the house until she earns it back. Only give her one or two of the most used rooms.
Fourth thing is exercise. A tired dog will be more relaxed. Make sure she is getting enough exercise every day. Structured walks with you leading the way are great. Mental exercise is just as important so play games such as find it or give her puzzle toys. Frozen stuffed kongs and the like are good busy toys when her anxiety seems to be taking over.
Firth thing is environment. Make the house a calm place. I have 3 little kids are home and at one point I found I was getting really stressed out during the day. I started to play spa type music downstairs during the day and whenever I would start to get stressed I would focus on the music and it would help so much to calm me down. It might help if you have had a massage before (which I also REALLY recommend for you). Play some soft music during the day, light a candle, keep the house and everyone in it calm. Oh, and I bet she would love it if you started her day with a mini dog massage to relax her!
