Leaves drop

Without knowing what numbers are coming out of pot - too many options. But generally if she stoped growing it's calci lockout by leaf colour and actions. Only way - let her dry out, consume all moisture and only then water. Loads of people water too wet medium and it starts to have pH fluctuations and all deficiencies and lockouts from that. Cal mag is a must to buy for next watering, not more than 0.5 ml/l , water 50% of usual, let her return to cycle wet/dry/wet/dry. Then you can feed. No money for fancy food ? Calcium nitrate and Epsom salt are two things you need. Those are very cheap. Don't go higher than 2-3 g per gallon, try to achieve not higher than 800 ppm. Good luck !

Looks like it might need some feed, but before doing that check your numbers before to confirm it is hungry. watering solution and runoff, PPM/EC and PH. If you solution before hand is low its a safe bet its underfed. Good Luck