Salad
Goat cheese
Poppyseed Muffin
Stir Fry
Truffle
Vegetable Medley
Wine
All Eggs (except Void Egg)
All Fruit
All Milk
All Mushrooms (except Red)
Daffodil
Dandelion
Driftwood
Ginger
Hazelnut
Holly
Leek
Snow Yam
Spring Onion
Wild Horseradish
Winter Root

Leah has a different schedule for every season and for almost every day.
I will leave a link to the wiki page[stardewvalleywiki.com] for her schedule
U can only enter her house to give her gifts/speak to her after 10am even tho it says 9am in the wiki

I got the stardrop from her 10 days after the ceremony in 3rd of winter
In the morning she can also give u coffee or some fruits, wich can make for a nice gift to get your friendship with other characters up.
On rainy mornings she can also give you mushrooms from her "mushroom-hunting"

After u gave her the bouquet from Pierre's shop, on a rainy day for 5000 gold u can buy a Mermaids Pendant from the old man at the place where the broken bridge on the beach takes you

I will revisit this guide after the 1.6 update is out and edit it if needed.
Also, PLAY THE GAME WITH THE WIKI OPENNNN!!!!