I want my parents and sister to come and visit me in US. But my sister’s profile has been sent for this year’s H1B lottery from her company. Should she file here B1/B2 Visa now?
No issues at all. She can apply for B1 now and have it stamped to visit you. If she gets her H1 approved, then she can go back to the consulate after June and have it stamped. Both are independent, as the purpose of both visits are going to be different.