Ok. Are you using v1.1(G.R.)? not the compressed version.I'm playing on PC and got the same bug, the flashing star doesn't appear.
Assuming you do.
Try attached save from the beginning of day 15 (Sunday). Walk her over to Mrs. Clarkson's house and follow the guide and stars should flash. if they do not, you must have a bad version of v1.1 (G.R.). Guide here:
You must be registered to see the links
How to install and run the save:
1. Download attached, (file15-Copy.rar)
2. Open windows file explorer.
3. Locate the downloaded file (file15-Copy.rar) and move it into your save directory.
The save directory is a subdirectory to where your game is located. Should be something like:
C:\....\Lily of the Valley V.1.1 (G.R.)\www\save
You will see all your individual save files here + config.rpgsave, global.rpgsave files (do not mess with these last 2)
4. Unrar the file15-Copy.rar file into something like: "file15-Copy.rpgsave"
5. in order for the save to be visible for the game you need to replace an old save (that you no longer need) in this directory. Say you no longer need save2.rpgsave. Delete save2.rpgsave and then rename file15-Copy.rpgsave to save2.rpgsave.
6. Go back to the game. Go to main menu (or just restart it) and load Save 2 (or what ever save you replaced in step 5).
Hope this helps.