Thanks @dingotush
Yeah, I can’t remember if the total number of times is 3 or 4 – but that exchange can be less than obvious (which is why I mention it in the quick start guide).
Donna was intended to be a bit of a reward for those who figure it out, since she unlocks two of the three “better” endings. There’s actually a counter, so that you have to give her space before the “come in” option works. Her dialogue changes slightly each time, becoming more comfortable with each uneventful delivery. The key line is when she mentions her “big spender down there”.