It is daytime. There are no owls.

Well then, maybe she'll try again later this evening?

Nope, no owls.

She's not giving up completely but she'd going to give up for today.

The next morning there's mail again.

"Sarah, go fetch the mail."

She'll go to get the mail.

There's only one letter, and it's another copy of the one she got yesterday.

Well, that could be a problem. Nothing for it she'll effect nonchalance and put the letter on the table.

Uncle Vernon glances at the letter—

—then stares, his face going from red to green faster than a set of traffic lights and then all the way to the greyish white of old porridge. "P-P-Petunia!" he gasps.

Dudley's attention is caught, and he tries to grab the envelope.

But Petunia grabs it first, then looks at it and raises a hand to her mouth in shock. She opens it and reads the first line, and stops there.

Sarah keeps her expression carefully neutral but inside she's fuming. Alright, so they knew she had magic and they haven't told her, they're still not going to tell her.

"I want to read that letter!"

"Get out," she whispers, "both of you."

Sarah will leave the room without complaint. She's going to go work in the garden. She needs to do something with her hands.

Dudley has a short-lived fight with his father and is promptly kicked out as well, and the door closes. He immediately puts his ear against the keyhole.

Sarah will keep going towards the garden. The Dursleys probably aren't going to say anything important and she needs some fresh air.

Uncle Vernon and Aunt Petunia argue for a bit and then Vernon leaves for work without sparing Sarah a glance.

Sarah goes to read the list of equipment in her cupboard.

The list is also in fancy ink:

HOGWARTS SCHOOL
of WITCHCRAFT and WIZARDRY

UNIFORM
First-year students will require

1. Three sets of plain work robes (black)
2. One plain pointed hat (black) for day wear
3. One pair of protective gloves (dragon hide or similar)
4. One winter cloak (black, with silver fastenings)

Please note that all pupils' clothes should carry name tags.

COURSE BOOKS
All students should have a copy of each of the following:
  The Standard Book of Spells (Grade 1) by Miranda Goshawk
  A History of Magic by Bathilda Bagshot
  Magical Theory by Adalbert Waffling
  A Beginner's Guide to Transfiguration by Emeric Switch
  One Thousand Magical Herbs and Fungi by Phyllida Spore
  Magical Drafts and Potions by Arsenius Jigger
  Fantastic Beasts and Where to Find Them by Newt Scamander
  The Dark Forces: A Guide to Self-Protection by Quentin Trimble

OTHER EQUIPMENT
  1 wand
  1 cauldron (pewter, standard size 2)
  1 set glass or crystal phials
  1 telescope
  1 set brass scales
Students may also bring, if they desire, an owl OR a cat OR a toad.

PARENTS ARE REMINDED THAT FIRST YEARS
ARE NOT ALLOWED THEIR OWN BROOMSTICK

Lucinda Thomsonicle-Pocus
Chief Attendant of Witchcraft Provisions

Sarah sighs, that's not particularly helpful. No hints whatsoever about where she might make contact with the magical world.

Nope, none.

Well then, maybe she can get up early tomorrow morning and try to catch whoever or whatever is delivering these letters.

She might need to be rather sneaky to do that.

Well, the last two letters were delivered at the normal time. So, her best chance would be to leave during breakfast but before the mail is delivered. If the Dursleys will let her... Maybe she should ask Emery if (s)he could catch an owl without killing it. She goes outside to garden and talk to her pet snake.