1） 800k
2)  600k
3)  400k
4)  200k
actually 800k house 400k still owe bank so we only pay 400k all these years (just ignore the interest this is just estimated amount) so each of us contribute 200k to the house, I just want to get back 200k which is all I paid all these years for the down payment and the loan, I definitely lost a lot of money in this process but the important thing is I just want to get back the agreed 200k that's all.

how long has the house been purchased? Take note on the taxes (RPGT)

BTW there is no selling half. Better sell the house to her with a clean-cut else it is only possible with side agreement which is messy too.

She needs to purchase the house with new refinance under her name.