House-trained mini dachshund having accidents

Question
I have a 3 1/2 year old female miniature dachshund. She is fixed. My husband and I crate trained her, just like we did with our two other dogs (Chihuahuas.) My dachshund has accidents while my other two dogs do not. There seems to be no reason for the accidents. I try to spend good quality time with her - giving her positive attention and playing with her, thinking that her accidents were her way of asking for more attention. The extra positive attention doesn't seem to work. When we are gone, she is in her crate. When we are sleeping, she is in her crate, but when we are home we allow her to run around and be with us. She will be fine for quite some time, then the accidents start up again. We will let her outside and watch her pee before letting her in the house. An hour later, there is a trail of pee across the carpet and she is hiding like she knew she did something wrong. I would appreciate any suggestions on how to nip the accidents from recurring.

Answer
A "trail of pee" suggests to me one of two things: submissive urination (a personality trait that worsens with discipline and especially with overt anger) or urinary incontinence (seen in spayed females.)  Positive attention does not control house training problems; anger when urine is present creates in a dog a strong fear response.  The dog has NO IDEA why you're angry but begins to associate it with the presence of urine (or stool) and then looks "guilty" (to humans) because the urine (or stool) is present.  I guaranty you that, were you to say to her "what is that" and point to a piece of fuzz on the rug, she would show "guilt"...this is a fearful, submissive posture.  She has no idea she's "done something wrong", she DOES have a conditioned fear response to the presence of urine OR your body posture (when we are angry, we exude adrenaline and our facial and body postures show our anger...dogs watch us very closely and they understand this.)  

Reinforce the dog's appropriate elimination by not only observing her urinate, but PRAISING and food rewarding her urination, outdoors.  Take her to the veterinarian and report this (apparently) uncontrolled urination; there is a medication available to assist her if it is urinary incontinence.  The "trail of pee" makes me think that this is totally unintentional on her part or that SOMETHING occurs that makes her fearful and she is unable to contain her urine.  Be a detective and see if you can figure out what, if anything, might be doing that (a sound from outdoors, the TV, a light fixture...anything odd we wouldn't normally notice can set a dog off!)  Talk to the veterinarian and see if she qualifies for medication.  Don't give up.  This is not her fault.