Laminitis is a very serious issue and one which takes a pretty long time to sort out properly. A pony which was diagnosed a week ago is far from ready to go out again. It can take weeks for the pain to diminish, and months for the hoof to grow back to anything like normal. If the pedal bone has begun to rotate, there could be very serious long term damage done by turning the pony out too early.
Starvation paddocks are dangerous too, especially at this time of year, as the growing grass is stuffed full of fructans which will just cause another case very quickly.
Ponies with laminitis need to be kept in, preferably on a bed of sand which will help support the sole and the pedal bone, and fed only enough hay to keep them alive. Any excess weight must be got off them as quickly as possible, and they should have bute regularly.