Hi,
There are few ways how you can discourage your lorikeet from laying anymore eggs. Try them and see.
1. As you have mentioned you have separated Sam from her pair, it is really a good idea, just to stop her from provoking towards sex. It will just throw her mind off.
2. You can even try changing the surrounding of the cage by moving the cage around or place it in another location also gives her an odd feeling.
3. If you wish you can even try hormonal therapy which will cease the egg-laying.
4. Birds begin to lay eggs as spring approaches, and as the days get longer. So try to stimulate winter. Keep the cage complete darkness for 16 hours and daylight for 8 hours. Continue this for 2-3 weeks.
5. Do not pet your bird by touching. This might stimulate them.
Note: Don't ever push her belly. You could break the egg inside her and kill her. Give her some balanced diet.