Biologics work well for many people and docs want to find ways to alleviate suffering. I don't see a reason why you couldn't try immunosuppressants and/or antibiotics and/or budesonide (which are all (maybe not antibiotics) treatments for various IBD conditions as a first go (the risk being it maybtake several months to see if they are working and you run the risk of inflammation/ulcers/granulation getting worse, and when things get worse it can be harder to get back under control) before biologics. It's your body, so you should have the final word. I would straight up ask the doc why she is not considering non-biologic options if that is something you would like to try. They are not usually the only option or even necessarily the first go to for treating Crohns or UC either. Treating/not treating and all the treatment options have there own set of risks/potential side effects.
you need a doc you feel is listening to, can answer your questions about treatment Rex's, and that you feel you can trust. It is definitely your perigotove to ask "Why doesn't it make sense to try X?" "Or why don't you recommend trying Y first" - she may have reasons that make sense, given your unique situation, but you need to feel comfortable with the reasons/rationale.