Six year old dd, new baby, behaviour regression

[Sleepglorioussleep]

Feel as if I constantly have something to ask on here at the moment! Dd is in year one, ds is nearly three and dd2 12 weeks. Am finding dd2 very straightforward, sleeps and feeds well and ds really settling and no trouble really. Dd is such hard work. Really tired behaviour most of the time, and we've just had a horrible playdate here with lovely friend. Dd was awkward, obstinate, didn't want to share, wanted her turn but not to give turns to others. Felt as if my three year old back again,on a bad day. Luckily, dd's friend's mum really lovely when came to collect. I was fairly honest about dd1's behaviour.
If this is temporary settling into big changes stuff, I can cope but I am worried people will get fed up with it.
I know she gets little of my time at the moment. Mornings are about getting ready for school, evenings about reading, tea, dd2 being a bit crabby. So whilst I guess this could be attention seeking, I don't know how to prioritise her needs. We also started a lift sharing thing for school but I think I'll knock it on the head as I think the journey to and from school is quite nice time for dd1-dd2 is usually asleep and ds is in pushchair.
But if this is my life with dd1 long term I am just going to go under.

[Oblomov]

This is not permanent. Don't worry.
Is very common. Ds2 was born when ds1 was in Reception.
many parents say the same. And it may be a bit of sibling rivalry, but many parents have said they get the stroppy, answering back, not taking turns child. And there isn't even a new baby. I'm saying it happens to quite a few of us. Try not to worry.
'Tis just a phase'.