yuhoo...after few weeks of googling,i've found the way to make her stand.but i myself haven't try it.
here you are :
1) Immerse ayupan legs in hot water for 30 seconds
2)Then,immerse ayupan legs in cold water for 30 seconds too.
3)There you go.ayupan can stand
How to make ayupan as keychain
Things you need :