Not soap ! - sponge the area with warm water or a proper dog-shampoo (used sparingly). If in doubt, consult the vet. If it is an allergy, perhaps you can think back to when they first occurred and identify something ?
Three 15 minute walks a day is not nearly enough ! Try a couple of hours at least, morning and evening. If I do 2 - 3 miles, the boys cover at least 5 or 6, probably quite a bit more. These are hunting hounds and they need exercise - to be able to run and run !
She is just not tired enough and probably also bored.
@jengosmonkey - NuHeart only does Heartworm, Heartguard Plus has meds for roundworms & hookworm. And people that give heartworm for 6 months are typically people that live in climates that have a cold winter, ie: when the ground freezes. We do not have that in this part of No. California so I give it year round.
Like much internet advice I find short answers incomplete - and mine was. I really want to ad that making a crate/xpen/gated puppy area should never be seen as "punishment". These partitioned puppy areas should be conditioned to be safe places for a puppy/dog. Mine, thankfully, tolerates and even likes her xpens probably because it's where she eats, receives treats, sleeps, chews and even plays. This took about a week or so. Now she voluntarily goes into her xpens (in my case) on her own and when she's put there involuntarily she might whine for a minute before settling down with a chew and/or going to sleep.