If everything is straight and nothing else is wrong with he frame or a-arm, all you need to do is adjust the tie rod to reset the toe.
Check the tie rod ends on that side. I had one bend on the threads once, and it made a wheel sit crooked like yours is also.
The tie rod can be adjusted easily. Loosen the 2 locking nuts on the end and turn the rod to set toe. Relock the nuts when it's set, ride!