Thanks, we are super excited, its our first child. When should we apply? around November I guess? I was reading that the processing time was 4 months but we want to get it in enough time to get a decent price on a flight as well as her being here before the birth.Such wonderful news. Congratulations
Now that there's a baby on the way, you can consider applying for a super visa for your mom-in-law so she can stay longer. Hopefully for up to two years. She can demonstrate the same strong ties that she was building up for the TRV.
Do post the list of documents + changed circumstances, etc before you apply. IMO, it's too early to apply