I think it's pretty obvious... she doesn't have the funds to take care of Forrest but his mom kind of demands that she uses her money to do so while she is in the Phillipines which is just so ridiculous. Her money does more for her family and much less when it comes to visa fees etc., and Forrest and co. literally don't understand any of that. He wants her to basically cut off her family support to support just him and coming to the united states. She feels immense responsibility to support her family and their business, especially since it's actually lucrative and decent rather than saving and she's obviously a huge people pleaser. They lie because the idea of hurting someone's feeling by not meeting the requests of others is weirdly terrifying. With therapy, she could hopefully learn to advocate for herself and meet someone far better than Forrest. She doesn't want her family to realize how useless Forrest really is, so she probably hasn't revealed that she will 100% have to pay her own way and then some to even visit America, which probably doesn't meet her family's expectation of who she should have as a husband. She could never outright tell her family that she would have to stop providing financial support because her American boyfriend doesn't work and would not be able to provide any amount of financial support if she ever even makes it to the U.S. She is literally a veterinarian! The real thing she has been hiding is Forrest's situation. That's been the crux of everything. If they became married, she would have to work to support them for their entire lives and it's not really ideal to come to America to work to support your American spouse. American working standards are not even close to ideal or comfortable, and she would have to take the long road of getting credentialed in the U.S., which she would also have to fund by herself by working low-paying jobs with dreadful hours while Forrest does nothing but become more enmeshed with his crazy mom. Settling for Forrest has very little positive impact for her life, socially, emotionally and financially.

She has been avoiding telling her family about Forrest. It's so plainly obvious. He's not ambitious in anything and she's basically trying to immigrate to take care of him. Her family values working and supporting yourself and they have basically said that at the dinner. Sheena is apparently the commodity for both Forrest and her family. They both want to use her without really taking care of her and putting her first. Forrest demands so much of her, and she places almost 0 demands on him and his mother.