Hi there, I hope you find the answer because it would really help me to!
Mine is a fraction younger, also female, she's 12 weeks so still being hand fed twice a day although she dislikes it and is not wanting the baby food at all. I have wanted to drop her to just one feed but her screaming has caused me to be a bit unsure about doing that.
She's eating fruit and veg along with Paradise Pellets (designed for fruit eaters).
She screams when she hears another of our birds, she screams when she hears loud voices or us talking loudly, she screams if you go near her cage, she screams if you take her out of her cage. I believe it's for attention not hunger but I can't seem to fix it.
I've tried putting her back in her cage when she does it, she screams. I've tried covering the cage, she screams. I've tried letting her stay out on my arm just not talking to her or giving her any pats etc until she's quiet, as soon as she's quiet and I reward the good behaviour, she screams! If you go near her cage at all, she screams.
She's stepping up, loves to sit with you, is not aggressive but moody like most female eccys

but the screaming is driving me mental too!
HELP!
Good luck with yours, it definitely sounds like wanting attention like mine. Weird that at 15 weeks the breeder hasn't got her stepping up. Mine's been doing it for a while now. It comes fairly naturally to them. Hand under the belly, bit of a push upwards and she should step straight up. Just keep repeating the word 'up' or 'step up' when you do it. I'd say if you can get her stepping up to take her out of her cage, she would probably be happier. Maybe not as noisy. But don't just take my advice haha, I've got the same problems!