Do not take out the water dish. It can be detrimental to health of the mother, who needs to be able to drink if she wants to.
How many days after shed to lay varies, and taking out the water dish could result in several days without adequate access to water.
Provide a dark humid place to lay and chances are she'll use it.
If you are really paranoid - put a big rock or something in the water dish so that she can still get at water to drink but can not get into it to lay.
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3.6 L. getula californiae - 16 eggs (Cal. King)
1.1 L. getula nigrita (MBK)
1.0 Pantherophis guttatus guttatus (Corn)
0.1 Pituophis catenifer catenifer (Pacific gopher)
3.3 Elgaria multicarinata multicarinata - 14 eggs (Cal. Alligator Lizard)