This is Dr. Christian. Welcome to JustAnswer. A few questions will help me get a clearer picture of the situation:
Her gums ar a normal pink color.
We just noticed this problem today (the bleeding), however, I have noticed her licking herself more than usual for the past week.
I am not sure if she is having trouble urinating. I put her out on her chain in the yard. I will pay more attention now of course.
She is eating a drinking normally.
She weighs 50 lbs.
The Advil I gave her was 200mg, and I gave it only about 15 minutes ago.