Emails are exhibits. Exhibits are to be exchanged prior to the hearing. This is done the same day as the hearing so each party can prepare objections in advance.
You should contact an attorney in your area for trial prep and/or representation. Many attorneys offer free consultations.
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Your question is fairly confusing. It sounds like you have done just enough research to get her in trouble. EMails, if properly authenticated (i.e., she says it's from you at your regular email address) are admissible as evidence in a proceeding where a party is the person writing the email. If she fails to authenticate this, then you have a variety of objections to try to keep it out (most will fail if she has a good attorney): failure to authenticate, lack of foundation, hearsay, etc.
The big "unless" here would be "unless" you could show she altered the emails. The best way to do that would be to have your own email printouts. Or, you could argue that the emails come from an inherently unreliable source and you think she's tampered with them. Keep in mind the Court can decide to overrule your objections and let the documents in anyway, unless you have your own emails to present as the true and correct version.
I don't practice in LA COunty. But if the Court ordered you to exchange exhibits before trial, you better do so, or - depending on your judge - none of the exhibits may come in.
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