it just turns into her rolling over crawling pulling up etc
She just won’t lie down or settle even if I get right in there and hold her down gently she’s just wriggles and cries
This is a normal phase babies go through when they learn to crawl. Even babies who have always slept independently will go through this phase. It is therefore not a reason to think in-cot settling won't work, you just have to be consistent and get through it.
At its most basic, what you are teaching baby is that in order to go to sleep she must be still, calm and quiet. She doesn't know this. It's so ingrained in your own psyche that it's difficult to grasp that your baby doesn't know this instinctively. Baby's instinct is "I am distressed" (because I'm tired and want to be asleep) and a baby's responce to being distressed is thrashing around.
You need to go through the process of teaching your baby: when you feel distressed because you are tired, you need to be still and relax. Obviously you cannot explain that to baby. So you have to physically teach it.
What to do? Start with setting your own demeanour.
Keep in mind your aim - calm, stillness. So you behave in this way too. Keep your movements, voice and all dealings with baby slow, quiet and calm. There may be tears and fighting against you, but keep your own responce away from being tense. Also, be compassionate- your baby needs your care and attention. So don't get cross or ignore baby.
Next for teaching baby.
You need to just keep going, don't give in just because your baby doesn't understand she needs to be still. You are there to teach her. If she is struggling to understand then carry on teaching her, in a kind and compassionate way, but without giving up and deciding not to bother teaching her.
Put her down and put your hand firmly on her chest. Bend low into the cot so your face is close to hers. Tap on dummy if she gets distressed and need reminding to suck. If she still cries then remove dummy and get baby to actively seek the teat (tickle top lip or cheek with teat so she turns to actively take dummy).
Stay bent over cot close, hand on chest to keep her still. If she squirm to the point where your hand on chest can't keep her still, lift baby to an upright hold on your shoulder (not a cradle hold, you're not looking to get her sleepy). Just a brief cuddle and straight back down - hand on chest and bend over cot to be close. The lift-and-return is a reset to reposition baby lying still, not an aim to calm her. The calming happens in the cot.
Then just repeat repeat repeat.
Into cot > hand on chest > active dummy sucking > wait. If squirming try patting with hand and tapping dummy > if still not staying still lift and reposition > back to the start.
Repeat repeat repeat.
In the end baby will still and settle. Once still and calm, lift your hand but stay by the cot. If squirming replace hand on chest until still, then withdraw hand once calm.
Wait by the cot until fully asleep - deep sleep. So a good 10 mins after first going to sleep. That allows you to respond quickly if stirring in sleep. Then seek out of the room ninja style.