Physiotherapy treatment  must

Bhujang Asana -- Lie flat on your stomach, keeping the palms out, bend the neck backward, take a deep breath and while holding it for 6 seconds, raise the chest up. Release breath and relax your body. Repeat the exercise 15 times twice daily. Core Strengthening Exercises- Straight Leg Raised With Toes Turned Outward, repeat 10 times, twice a day. Chiropractic treatment. https://www.youtube.com/watch?v=HxvRQ9ZJ8vQ

She shud get assessed online for her posture accordingly exercises can be given

Relaxing Neck & Shoulder Muscle and Swelling for One Time Is Different Thing But It's Always Better To Work on Root Cause. You Can Do Hot Fomentation & Some Stretching Exercises for Relief. But in Case of Neck You Should Consult A Physiotherapist First Before Doing Any Exercises.

She should Consult online/offline personally to physiotherapist for diagnosis and assessment.

She should consult a Physiotherapist or Orthopaedist for complete assessment and treatment.

Due to compression the back the neck got swollen, it can be redyce by applying hot pack twice a day. If applied diclofenac ointment before hot pack will be very helpfull in relieving pain as well. Later after reducing of pain start with neck and shoulder exercises. Same apply hot pack at lower back for back pain issue. If possible take an xray of cervical spine to confirm if there is any issue with nerve or discs located in neck.

Don't worry firstly you have to reduce swelling by applying contrast bath ( both ice and cold pack application).

It might b due to trapezius muscle spasm (protective phenomenon- to avoid further injury) Ask her to apply ice Movements at neck and shoulder are encouraged As she is unable to lift her left hand, ask her to take assistance from her right hand and ask her to clasp her fingers and then ask her to do slowly overhead shoulder movements Is she diabetic ? Better if you consult a physio nearby So that ROM can be thoroughly assessed Accordingly Initially pain management follows Mobilisation/manipulation techniques can b planned

You have to work on swelling around neck & starts as shoulder exercises as early as possible under physiotherapist guidance as per my opinion. Apply hot pack around neck.

Hard to make a diagnosis based on limited information. You might need to visit a physiotherapist clinic