Try adding a tablespoon of canned pumpkin to her meals. This should help solidify things. Also try feeding a little earlier for the evening meal and watch bathroom breaks to makes sure she poops before bed time.
When it comes to adding oil based supplements, you want to introduce it slowly. Oil makes things move faster, so the digestive system needs to work up to being able to handle the full dosage. That should really be rule of thumb when making any changes to your dogs diet.
"i can explain it to you, but i can't understand it for you."