Its kind of dismal here. The alternatives for your child are:
1.) JG
2.) Patschoolhouse, the level of chinese the children achieve are not bad... but you are already ahead if you speak to your child in Chinese. Am not sure what age they accept kids.
3.) the Chinese
International School but your child has to be 3 years old. They will at least get 50 to 60% chinese. The chinese teachers are quite good but the school isn't for everyone.
4.) Hire an indonesian or thai maid that speaks mandarin (so far the ones I have interviewed are ok)
5.) Do a combination of Berries, the confucius institute, some local activities for that age group run by China nationals.
I don't know anything about Buttercup.