As someone who has done freelance work for a long period of time, let me tell you that this won't work, even if you factor out the fact that this is your T.

False claims: If she needs a computer job done, there are plenty of people around whom she could hire, even in rural areas.

She is unspecific about what she needs you doing.

>>> So you are left unable to decide whether you have the skills necessary to do the job.

>>> Since she is not specific you are also left unable to determine how much time the job would need, both in best case and in worst case scenario. This means you might commit for a task that is far beyond your time capacities.

>>> What if T is not happy with your job? Are you supposed to improve the outcome? How often would that be? How often would you feel obliged (or rather forced) to do this?

So even if you look at this from a "professional" angle only (without the T-factor): This simply cannot work and you'd get the short end of the stick in any case.

Add the T-factor and this is a setup for desaster:

- confidentiality: You get insight into T's private life, and also, potentially, into info about other clients.

- dual relationship: you already feel "obliged" to do this for you T. This in itself alone should raise massive concerns. Your T should never have asked in the first place.

- what if you decide midway that you are not the right person for this job? Or that this takes up too much time, more than expected? Are you free to stop doing what you're doing? My guess is: No.

- what if you cannot do the job, cannot leave it be, and your T is unhappy with the outcome? what if you spent your future sessions on conflicts that came from this job?

No matter from what angle you look at it:
this cannot work. ever. at all. You will lose out in the end.

And in my opinion, your T is either incredibly naive or incredibly self-involved to not consider this thoroughly, before even asking you.