Yes, you can half or crush the tablet if necessary or dissolve it in a small amount of water and syringe it into her.
Mixing with a little coconut oil or food can be done too if she's eating.
To pop a pill or tablet into the beak, hold the head, pull down on the wattles to open the beak, put the tablet into the beak and let go of the wattles, let her swallow.
If she's egg bound or struggling with a soft shelled egg it's very important to get the Calcium into her to see if that will help with contractions so she can expel the egg or material.
Encourage her drink.  Sugar water or electrolytes would be good.  Hydration is another important part of the process.  To make sugar water, mix 1tsp sugar to 1 cup water.
If she's lethargic, don't soak her in water or a bath, this can be stressful.  You can however, place her in a steamed up bathroom or provide her with a heating pad (covered with a thick towel or similar) to see if that helps.
Is she able to poop at all?