Hello,
I am one of the women who had real issue coming and I never came from just penetration alone. And at times I just cannot orgasm still or it takes me forever. I am not on contraception so I guess the natural circle plays a role in it as well as how tired I am at times. There are few things you can try.
1 stop worrying about her not having orgasm. When my partner wants to make me cum, I get a sort of block in me and its even much harder. Just let it be and see if it happens.
2 try clitoral stimulation. Either oral when she is really turned on, as this does work on me, but I can sometimes take some time. Or use vibe. Some women do need stronger stimulation, but how strong I need does also relate to my hormonal phase, as I can go from not so sensitive to far more sensitive.
3 when penetrating her, you can either finger her, or choose position so your penis is rubbing her clitoris, or use a small vibe. Maybe one of the bullets. To stimulate her clit.
4 there are some orgasm boosters which can make orgasms more achievable or stronger or both. I sometimes do use them when I cannot orgasm for long and it does honestly help a lot. But they dont work for everyone, but could be worth the try.
5 you can try stimulating her G spot, by either fingers or toy, but G spot orgasms are not what majority of women gets, so this is bit tricky.
It can take time for a women to orgasm, but I read it on the forum, that once female members came for the first time, it was much easier. Just take your time, explore her body, and find out what really turns her on and see where it takes you. And believe me, that its likely she is already enjoying it without the orgasms.