sorry, but an hour a day of free running is just the beginning. Springers are working dogs and can run all day. She needs a mental work out as well as a physical one. Train her to do anything and give her training every day, short sessions building up to longer ones...
I have two seven and a half month pointer crosses (weimaraner/GSP) and have had weimaraners now for ....gosh...just added it up, more than 20 years. Working breed gundogs are lovely to have around, smart, loving, gentle and fun but they must be worked in some way or they will go crazy and so will the owner!
training suggestions, basic obedience, agility, hunting for items/people, retrieving (of course) you can also use a kong for feeding which gives much pleasure to the dog and engages the brain as well as the stomach.
Finally, digging is a dog thing and they do enjoy it...could you give her her own digging area? Bury toys and chews in it so she hits paydirt when she digs there and when she digs elsewhere, stop her and take her to her own bit