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You can write to the Court, and they will put your letter on the file, which the Judge will read at or before the next hearing.
It's unlikely that your letter would be referred to a Judge to address prior to that time as you're not a party to the proceedings. If your daughter wishes you to help her, then you can do that by turning up with her at the next hearing and either asking the judge for permission to speak, or if that is declined, you can exercise what are called "McKenzie" rights.
This is where you sit in the court and tell your daughter was to say, and/or pass her notes, which she then acts on. You can do this. In practice, a lot of judges do just let you speak, even though you're not a lawyer, because it's quicker, although there has been something of a clampdown recently in this respect with people insisting the person that bought the proceedings do the talking. However, you ALWAYS have the right to sit with her and help her with what to say etc.