Strategies for parents B1/B2 reapplication after 214(b) refusal in Kathmandu

My parents recently had their B1/B2 visa interview at the US Embassy in Kathmandu for my upcoming graduation, but they were refused under section 214(b). The officer did not look at the additional financial documents we prepared and the interview lasted less than two minutes. I am planning to file a new DS-160 for them immediately as the ceremony is in three months. Would it be strategic for my mother to apply alone this time to avoid the appearance that the whole family is traveling, or does that look suspicious? Also, is there a specific cooling-off period required before reapplying at this specific post?

Has anyone from the South Asia region actually used the ‘split application’ strategy successfully for a graduation visit specifically?

I was informed of a similar decision regarding my own travel documents last year. In order to comply with the refusal reason, I spent considerable time gathering additional proof of property ownership and my academic tenure, yet during the second interview, I was not effectively allowed to present these physical documents.

Realizing this is a time-sensitive situation for your graduation, you need to manage your expectations regarding the ‘immediate’ reapplication.