Are you for real? a good C cup? Do you even understand how bra sizes work?
Lina for her small frame would probably be at LEAST a 10DD but most likely an E cup. Because she is tiny wee with massive breasts. The smaller the body but larger the breasts, the bigger cup size.
Many men underestimate breast sizes. I don't even understand why so many guys sit around talking about women's cup sizes when they don't know shit about them. I've had guys assume my breast size as a "C" cup due to all the stupid porn they watch thinking they know all about breast sizes. Most don't realise how varied proportions work on various body shapes, chest widths etc. I'm a size 10 DD when measured, but you wouldn't know it unless I wore a bra that showed them off. I couldn't fit into a smaller cup bra if I tried, my nipples would just poke out. A "D" cup is actually much smaller than you would realise.
A "c" cup chest looks different on every body. You can have a small looking "c" cup chest and a large looking "c" cup chest. Lina is absolutely beyond a "C" cup. They would overflow out and snap that bra.