H-4 EAD

First of all thank you for all your blogs and videos on immigration. They are very informative and knowledgeable. I follow your views and suggestions on all my immigration work. I also recommend your suggestions to lot of my friends and colleagues. I appreciate your help towards the community.<br>
I have a situation:<br>
I am in my 3rd year of my H-1B status, my I-140 is approved and need to file for my spouse H-4EAD on May 26, but she needs to travel to India for family reasons in August this year.<br>
Questions:<br>
1) Will that be a Ok for her to travel to India while her H-4 EAD petition is pending?<br>
2) How long will the petition will take to come to a decision (~estimate)?<br>
3) What happens if her H-4 EAD petition gets approved and she is in India? Does she have to go to the US Embassy again?<br>
4) (Being positive but need to think the other sides of a same coin) what happens if her H-4 EAD petition gets denied? Will she be able to retain her H-4 status? Will she able to enter US without any issues?<br>
5) What would you suggest? Will that be ok for her to visit (or) to wait till the decision is made on her H-4 EAD petition?

My wife is eligible for H-4 EAD, I know there is no formal way for expediting the process but I've seen a clause in F-1 (OPT) EAD process called "financial loss" and if you've got a job and submit the offer letter while you're waiting for an EAD to get approved, they process your case faster and you get the EAD much sooner than expected. Does this rule apply for H4-EAD as well?

Q1. Among the documents needed for filing H-4, what are the ones we really need to make sure, we have them. I mean few like Date of Birth Certificate from Indian Municipal/Registration office..... is that needed even for H-4 EAD. What if the name on the Birth Certificate from Registration office is different from name on Passport? What should be done here? Any other documents etc. we need to be careful about and should be working to get ready now. (Education certificates and marriage certificate etc. we already have)
Q2. Would it again be first come -first served in terms of filing H-4 EAD? I mean people who file on May 26-27 --would their applications be processed earlier than the ones who file little later.
Q3. Approximately how much time it’s expected for EAD to arrive, everything going well
Q4. One last question, if I happen to change my employer at this time, and if my GC process is re-initiated would my wife be still eligible for filing H-4 EAD or NOT ( in a situation if old employer revokes I-140 )

My I-140 was approved on Sept 2011. I came to US on 2008 beginning on L-1 visa and then my employer converted to H-1 visa. On February'15 I got an extension on my H-1 visa based on I-140 approval but I didn't get it for 3 years from Feb'15 rather I got it till Nov'16 (about 1 year 10 months). I am thinking to join another company now. What should I consider before I transfer my H-1 to employer B from employer A on my situation? My wife is on H-1 and it’s valid till 2018. I am also thinking my wife to apply H-4 EAD rather continuing on H-1. Is that going to be a better option?

I am on H-1B visa more than 6 years. I also have I-140 approved. However my H-1B is under renewal process. I do have 'receipt of notice' but not approval notice yet. Looking at the waiting time I don't think I will get H-1B approval along with renewed I-94 before May 26th 2015. I need to file EAD for my wife on 26th May.