Never dewormed. Pl advice as to how can we.
I would do either Safeguard liquid goat dewormer, which you can pick up at a Tractor Supply, or Valbazen. Safeguard you give to each bird at a rate of .23 ml per pound of body weight. And then you repeat the treatment again in ten days.
For egg binding, you can try giving some calcium gluconate liquid as this can help a hen pass an egg. This is also something you should be able to get at TSC. The dosage can be found here:
https://www.backyardchickens.com/threads/calcium-gluconate-dosage.1282103/
If that doesn't work, you can try a warm bath.
If she is egg bound, usually you see signs like them straining in the nest box but no egg, lethargy, sometimes panting, and sometimes lameness in one or both legs if the egg is pressing down on the nerves. In some cases you may also be able to feel the egg in the vent.