Type of Visa/Pass for Mother In Law (china)

I am  Malaysian and my husband is from China and he is working in Singapore.
I want to invite my mother-in-law (Chinapassport) to stay in Malaysia for 6 months.

I asked Jabatan Imigresen Malaysia through their website, but there was no response for 1 month.

Anyone here can suggest which type of visa/pass can I apply for?
Long-term social pass or dependent pass?

Thanks in advance.

Look like no one has ever encountered this before.