PTSD Symptoms

I am worried about my 7 year old daughter.  She has been receiving ABA therapy but with some outside research I am beginning to wonder if she is not suffering from PTSD. Some of her symptoms are:

• losing interest in activities
• having physical symptoms such as headaches and stomachaches
• showing more sudden and extreme emotional reactions
• having problems falling or staying asleep                  
• showing irritability or angry outbursts
•  having problems concentrating
• acting younger than their age (for example, clingy or whiny behavior, thumbsucking)

She went through a particularly trying event about six months ago, and it seems that since then it has just been getting worse.  Do you think that it could be PTSD? Or am I just an overreacting mother?