during my pregnancy L started to become a daddy's girl. Even though I stay home she would get super excited when he got home and he would do bath time. Other than bath, I do all of her routine with her. We play a lot during the day and she is happy with me, but when daddy got home she could take me or leave me. Then my dad came to stay with us before M was born and he has been here about 2 weeks. L became really attached to him. She started to want me around less and less. Since I have come home from the hospital she doesn't want anything to do with me. She doesn't get excited to see me, she actually cries if I try and hold her or read to her. I don't know why she suddenly hates me, but thanks to the hormones I can't even write this post with boohooing all over my phone

I feel like I am the only SAHM who's toddler hates her...
Re: DD hates me :(
As for crying when you hold her right now, it's probably due to the huge change in her life and routine brought about by your new DS. Give her a few weeks to settle into the new routine and see that you are still there for her and love her.
If it makes you feel better, DD1 was all about me (I was an almost complete SAHM for her first year), and when she was 11 months old I had to go to a seminar for a week. I got back and it was like I was chopped liver compared to DH. She cried when I held her, always wanted him, etc. Seriously, kid? I cared for you almost 24/7 for 11 months, and then I'm gone for one week and you switch sides? Traitor.
BFP1: DD1 born April 2011 at 34w1d via unplanned c/s due to HELLP, DVT 1 week PP
BFP3: DD2 born Feb 2013 at 38w4d via unplanned RCS due to uterine dehiscence
First round of Clomid in May 2012= BFP #1, DD born January 2013
BFP #2 in January 2014, DS born September 2014
You're definitely not the only mama going through this. I deal with this with DS at times. He is definitely a daddy's boy and there are plenty of times that I feel like I mean absolutely nothing to him and he only wants his daddy. There are times when he cries when I try to take him from daddy at bedtime to say goodnight. When we're going through those tough times I try to carve out time to do things one on one with him: reading books, playing together, etc. I also try to take on bathtime and bedtime with him for a few nights until we're feeling more connected again.
Your DD is going through a huge change right now and you're less available to her since DS was born (I'm guessing you probably have primary responsibility for the baby, even when other family members are around). If there's any way to have certain times of the day that you hand DS off to your husband and get some one on one time with L, that might help. Maybe carving out some mommy playtime after dinner or starting to do her bath or bedtime routine while your DH has the baby.
Hugs to you! It's so hard to feel this way, and hormones are no help right now! It will get better though once you all settle into a new normal as a family of four.
TTC since June 2009
BFP #1 2/22/10 M/C 6w2d
BFP #2 October 2010 CP
BFP #3 1/11/11 M/C 8w5d
IUI #1 Aug 2011= BFN
IUI #2= BFP #4 9/18/11 missed M/C, D&C 10/18/11
IUIs #3&4 = BFN
IVF #1 May 2012 = BFP! Twins!!
Fraternal twins born Feb. 2013
DS1: Quinn - 10.22.10 and DS2: Cole - 01.18.13
My two cents is just to try not to take it personally, to continue what you are doing (spending time with your DD and expressing yourself to her) and to just wait it out. She wants her momma, she's just growing up and adjusting to her new lil bro