Same as my 好狗 maid! You should fire her cos' she is not given heart to do her job.
For my maid. I found the reason why she off my coputer, I know she does not want me to see her so many phone calls even bb meal time and neglect my bb at all. I have found a phone after she make my bb hurt. Of course, she denied everything.
May be you can say your husband is running very important company's program in the computer. It need to run whole day, & can not stop. Otherwise, it need to restart from the beginning. And tell her that last time may be when she clean the computer (just an excuse), the computer had turn off. And your husband was very angry about it. So he want you not to touch the computer in any way.
That's the way I tell my maid!! Because she's afraid of my husband more! :-P