My mom visited me in the US and stayed for a little less than 6 months (as mentioned in the I94). I was wondering how soon can she reenter the US. She has been consistently visiting me since the past 7 years but it has only been for a couple of months. However this year she stayed for 5.5 months and due to COVID, I'd like for her for to come back as soon as possible. Are there any guidelines on how soon can someone re-enter the US on a B1/B2 visa?