Please can you advise that if a pregnancy in its early stages (2/3 weeks) is causing severe mental health issues to the mother, is abortion allowed? And if so, what is the penalty if any?

If it is causing severe mental issues for the mother such that she cannot handle the difficulty of it, then according to Ayatollah Sistani she can have an abortion if it’s only 2-3 weeks since the fetus has not acquired a soul yet. She would not have to pay any penalty because the doctor would have to pay it (since he is the one who administers the abortion). Of course the doctor won’t pay it, but she would not be responsible for paying it.