My efforts to help my sisters wedding gets treated by bitchy comments 😡 enough is enough

♡ 𝓚𝓪𝓽𝓻𝓲𝓷𝓪 𝓵𝓸𝓾𝓲𝓼𝓮 ♡
So I'm here just to vent about how my best efforts to try sort out my sisters wedding can feel like it's getting thrown back in my own face.
I got married last April when I flew to America and it was such a last minute thing that both me and my husband just went down to the little court room place ( forgot the name ) with a few members of his family and that was it we were married. To us we never cared about a big flashy expensive wedding which people usually get in debt over. Our aim was to be a married couple and that's what we did, we were both in love and that's all that mattered.
Now unfortunately he was abusive so I flew home and left him, then gave birth to our child.
I live with my sister and she is getting married in July but everyone is basically paying for it for her and still she seems unhappy. She never sits there and arranges things when really we are pushed for time.
So to help I found a nice cheap bridesmaid dress and sent the link to the girls and I asked my sister one question and that was if she had put any thought of the order she wants us to go down so when we are stood side by side it will be in height order maybe. 
She said she hasn't and I nicely suggested she could do height order as for the pics also it would look nice.
Instead of a thank you she just turns round and says to me " what did your bridesmaids do at your wedding mm ? Did you have them in height order?" I just ignored her sassy remark as it really wasn't needed. She keeps slagging off and insulting my wedding over and over making out it was trampy and having a laugh knowing it didn't work out 
Am I looking into it too much and being too sensitive ?
She is aware I'm getting counselling to help heal and get over my abuse from my ex husband