递交 I-485 EAD AP 申请求助!

我的 I-140 EB1A 九月份刚批准。我目前是H1B.
太太目前是F1, under OPT, 现在在国内，F1续签在九月已经拿到，机票定在11月初返美国。
太太的OPT将在 Jan. 20, 2010 过期， 她的OPT是12个月，无法延期。她去年OPT生效前已经用了55天的grace period.
我准备等太太11月初回来后， 和她一起递交I-485.

现在有几个问题:

1, 太太11月初用 F1 入境美国会不会有困难? 她的OPT将在 Jan. 20, 2010 过期.

2, 太太入境后，律师建议等几周 (6 weeks) 后再递交I-485. 下面是律师的建议，是否有必要?
"When someone comes into the USA in one status and then immediately switches to another status, they could deny the second status, saying that they committed immigration fraud by lying about their intent on entry.
The safest way is to wait about 6 weeks after entry and then file. However, for this type of situation for EB-1 I have never had that problem. Just letting you know. I would wait a few weeks, however"

3, 如果我们在12月中旬（太太入境6周后）递交 I485 (including EAD, AP)， 明年1月20号前 EAD, AP能否拿到?
如果没有拿到EAD和AP, 我太太还能否继续在美国等EAD, AP？ 还是必须回国等EAD AP 批准?
有没有其他办法继续待在美国? 转身份为H4? Emergency AP?

请大家给些建议。

谢谢!