Hi Sharileedah,
I appreciate the suggestions given by Jerry regarding the T1-T4 mobility with the mobility of ribs. I will be more interested to check the status of your patient's latissimus dorsi on her left side. as you must be knowing that latissimus dorsi helps in maintaining the supero-lateral tension of the thoraco-lumbar fascia (TLF). Any slackness in the TLF also slackens the lumbar and cervical core muscles and this leads to slouched posture and expended neck.
Weakness in latissimus dorsi may be accompanied with tightness of pectoralis major and internal intercostals thereby limiting the mobility of ribs. So instead of mobilizing the ribs and vertebrae, first try to stretch the pectoralis major and minor, emphasize on lateral costal breathing, strengthening of latissimus dorsi, and work on core stabilization of lumbar and cervical muscles. This will help your patient with total relief. You may require total of 10 sittings.
But again prognosis depends on presence/absence of radiological evidence of thoracicfacet joint arthritis.
Please keep informed.