I definitely think you can say something. (And that it's a good idea to) Maybe your plan needs re-working so that it includes options for after hours as well, and that would help her be aware of that. If you need any medical attention (either just at home or from professionals) for what you've done, make sure you do that. Then you can say that you did self harm but have been seen to physically so she would not be concerned from that standpoint.
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