Please confirm these structures:
1. George would rather she be here tomorrow.
2. George would rather she were here tomorrow.
Yes, both 1 & 2 are grammatically correct. The second is the better as many people would use the hypothetical past automatically here. The first one, which uses the present subjunctive, is unusual. See Michael Swan page 475:
"A present tense or present subjunctive is possible (e.g. I'd rather he goes / he go home now), but unusual."