If you’re leaving the office to go into a different room, my guess is that she wants to go with you. Budgies are curious once they’re used to their surroundings so she likely now wants to see what is outside her room.
Candy does this exact same thing with my husband. He'll try to leave and she will land on his head. He'll walk her back to her cage, then try and make it out of the room before she gets back to him. She's too fast though, and always manages to get to him first. Then they play "Duck and Dodge" for 10 minutes while I sit back and watch the strugle between man, and teeny tiny beast. LOL