<human>: My sister in law recently asked me to be her matron of honor.  While I'm delighted to participate and honored, this came kind of out of the blue because, even though I've known her for almost 10 years (and been married to her brother for 5 of those years) I feel like I don't really know her.  She is shy and quiet and never really opened up to me about anything.  I'm an extrovert and very outgoing but she is quite reserved and will sometimes go an entire visit without saying anything to me.  

The wedding is approaching (in early November) and I've offered to do bachelorette party stuff, not heard back.  I have questions about not just if/what she wants for bachelorette but also who else is in the bridal party, what we are wearing, what I can do to help, etc.  

I started drafting an email to her to ask these questions and then I realized I don't even have her email address.  I have her cell but she rarely communicates with me.  A few weeks ago, her mom (my mother in law) had texted to see if I was available to meet so we could shop for fabric for the wedding but I was busy with work and put it off… and now I'm realizing all communication has either come directly from her mom or been because I poked her.  Like when she asked me to be her MOH?  My mother in law was sitting right there next to her.  

How should I approach this?  I feel weird already and don't want her to feel like I'm being nosey or bugging her, but I feel really out of the loop for a wedding that is happening in 2 months.  I've felt more involved in weddings I was just in the House Party for!

Can you give me a shortened version of the text?
<bot>: My sister in law wants me to be her matron of honor but doesn't actually talk directly to me.  How do I address this in a gentle way?