Processing time of LTVP

[Dark NT]

My wife and me are both Malaysian Chinese and recently got our PR.

My wife applied a long term visit pass (LTVP) for her mom a couple of months ago. After the application was submitted online, we had to wait for 3 weeks before the approval-in-principle was obtained, and another 3 weeks for the ICA appointment. She got a 3 year pass.

Last week my mom came to SG and so I applied the same for her on the day she arrived in SG. Surprisingly I received an email the next day informing me that the "application is being considered" and we were asked to go to ICA personally on the following day! (the e-appointment was automatically scheduled for us)

Since we did not expect it to be so soon, I rescheduled the appointment to a few days later to prepare all the documents required. The appointment is tomorrow morning so i gotta take a couple hours of time off. Strangely my mom was also not asked to do any medical checkup (my MIL had to).

Hopefully the pass can be approved tomorrow.
I am really not sure why the process is so different for the 2 moms.