There is no supplement, food or herb, or tea you can drink, to increase supply. It's all woo. The only thing proven to increase supply is increased removal (so pumping as well as nursing) and some prescription medications. So stop the fenugreek asap (there's actually some evidence that that's the only supplement that does impact milk supply, it can decrease it).
The usual advice is to triple feed. Nurse, then give a bottle, then pump. It's incredibly hard work, and deeply exhausting. I did it for nine months as I had insufficient supply and it was the only way to keep a meagre supply going. It took a long time for anyone to believe me that I actually didn't produce enough milk (and nearly ended in my son being brain damaged :( ), so I am here believing you. If your daughter is still hungry after nursing then you're doing the very best thing for her in topping up, and if you're able to pump afterwards you're still doing what you can to protect/build your supply.
Unfortunately for me, even with triple feeding and prescription medications I was never able to improve my supply. Approximately 1-5% of women are unable to produce enough milk for their babies, it's not a huge number but somebody has to be in that percentage. People are quick to tell you it's rare but that doesn't really help if it's happening to you!
My best advice is to join an evidence based facebook infant feeding group for guidance. Places like Kelly Mom and the La Leche League are full of misinformation, the La Leche League for example advise women to never use formula under any circumstances as it causes cancer. Not helpful, or accurate.
The best resource I've found is called the Fed is Best Infant Feeding Peer to Peer Support Group, on facebook if you have an account. Lots of really good support and information around all feeding methods, evidence based and zero judgment whatever you feed your child. Crucially they don't judge you for using formula, or tell you to stop using it when you have concerns around low supply. I've seen a lot of really awful breastfeeding groups promote dangerous and toxic practices and behaviours such as telling parents who don't produce enough milk to simply stop supplementing, keep baby on the breast and hope for the best, and encourage women to stop supplementing when it's clear their baby requires it. I would recommend joining the group I mention and making a post, their advice is very sound and safe/effective.
Good luck, remember whatever you feed your baby now or in the long haul they will thrive and do great, it feels like the biggest thing in the world right now to be able to breastfeed if that's your goal but we're not taught that even though most people who want to breastfeed will be able to with the right support, not everyone is physically capable of exclusively breastfeeding and that's okay, that's not a reflection on you as a parent, it's a medical issue that affects some people. If you decide to triple feed then I wish you luck, it was awful and I really regret doing it but I guess at least I know I tried my best. If it feels too much then there are some major benefits to formula feeding people rarely talk about, and I hope you get time to enjoy your beautiful baby.
A fed baby is a happy baby, and fed is best. You are making sure your daughter is full and that's wonderful, responsive parenting.