Any good with standardbred?

Question
HI, I have a 3 year old standardbred filly that is a quiet as can be in the barn and in the paddock and but when it comes time to actually race she is very very high-strung.  She gets herself very worked up and we have tried numerous things to try to help her calm down.  We have opened up her bridle, closed it up more, walked her in the center-field but once she goes behind the gate she pulls..We are at a loss...We have had her thoroughly examined and there is nothing physically wrong.  Do you have any ideas what we can do to clam her down before she races?  Should we skip the post-parade and just send her out when the gates are ready to open?  Any ideas would be welcome.  Thank you in advance for your ideas!!!
This filly has been trained in a mile and a half distances and the race itself is only 1 mile. She is jogged 5 miles daily except when she has a day off or two after racing.  She is jogged at different times everyday so not to expect complacency (do my job and finish).  If she does not race that week she is trained that week a mile and a half not just one mile like her races.  Not sure if this helps at all but it is more info

Answer
hi -- you can have a physic come to the barn and read the horse for you. they seem to know why or what is bothering the horse and can tell you what the horse needs to have done to improve the situation. i have done this many times in the past with many horses and have had excellent results.  it does really work. thanks ED HESS