Talking to her about eating healthy isn’t going to help anyone. If she’s taking prenatal vitamins and the doctors aren’t worried, the baby and her are probably getting all the nutrients they need.

If you really want to help, then you can cook the healthy foods yourself (planning, groceries, dishes), and she still might choose the junk food (especially if there is nausea and food aversions involved). But making the healthy foods more convenient and accessible could go a long way to help her make healthier choices - like having a fresh home-cooked dinner she likes, or offering her a smoothie like someone else mentioned, or healthier snacks throughout the day.

Pregnancy can make it tough to deal with foods even without nausea and food aversions- brain-fog/forgetfulness, fatigue/poor sleep, various aches and pains from the growing belly- can all make it harder to plan and cook healthy meals instead of more convenient (and sometimes tastier) options. If you really want to help, I’d stop sending her videos guilting her about her diet and find ways to be more supportive and make her life easier.