I don't know what the thinggy she has on her neck said but this picture look faf

ShikiEikiYamaxanadu said:

I don't know what the thinggy she has on her neck said but this picture look faf

Pretty sure it says "congrats on dying"
...
Way to go mokou!

I would say you're right since 祝死亡 seems to be that, no clue about what 奈何橋 on the tombstone is since it doesn't look like Mokou's name(unless in Chinese they use other kanji for Mokou).
I thought this was Japanese at first...