Breastfeeding

I hv a quest. My baby is 7 mo now. I latch her motn every 3 - 4 hours. Is it sufficient to maintain supply ? Or do i still need to pump motn? Cos my baby is at a teething stage.. sometimes idk if shes drinking alot or not. cos sometimes at work my amount drop by 20ml... sometimes its the same amount and didnt drop.. Hard to pump motn as i find my lo very clingy now. Cant put her in cot n she js want to sleep on my bed.. beside me. Will cry when i move away.