If i recall correctly, you need to give her the flowers to increase her stats the most out of all those items.
Save the game before you offer her any item and see what the result is... or just backstep and try a different one.
Failing that... try a walkthough, there's plenty on here, in another part of the forum, (link below) as they should still work, assuming you're not doing the latest "test" version which is heavily bugged,and could well see you have game play issues.
See the latest change-log (
v0.8.3 Test) for details with regards to this.
V0.82 walkthrough link
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There may well be newer ones so do check the Walkthough and FaQ thread for updates. Use the search function at the top of the page.
Edit update:
Don't try to use any saved games with the latest Test version (V0.8.3 Test) as they will not work at all.
Faerin will be adding a saved game file to the next update (this current game version is a test version, as only Veronica is actually playable, for now and this version is purely a test for the U.I. and to aid in testing for Patreon members (on that site)