Exclusively pumping...

Hey ladies! I have a 4month old daughter that is EBF...she started having trouble about a month ago not eating much and super fussy after each feeding. Long story short I finally figured out that she wasn't getting enough to eat. I wasn't producing enough for her. So now I'm pumping every hour on the hour, feeding her every other hour then pumping for 10-15min after she's fed then pumping again an hour after that. I'm slowly seeing some progress. 👍 today I fed her on the boob...she acted like she had a tummy ache and kept latching off..(not the first time) so I gave her what i pumped before in a bottle and she drank it all without a problem!! Soooo I'm not sure what the deal is but she seems more satisfied drinking from a bottle than from me.. so my question is how can I exclusively pump to make sure I'm making enough for her without feeding her to stimulate my milk?? I drink water, water And more water as well mothers milk tea at least 3 times a day...Any other tips would be greatly appreciated!! Its stressful on a momma! Thanks ladies!