Still crying at bedtime over a month into sleep training

My LO is a little over 5 month. We did Ferber a month ago and although night awakenings have reduced since then, we are still struggling. Initially she cried at bedtime then we had a good stretch of little to no crying at bedtime. However for the past week, we are back to crying at bedtime anywhere between 10-20 minutes

She’s a low sleep needs baby, used to wake up hourly until we increased her awake time and now it’s better although she does still wake several times a night. Schedule is 2.25/2.75/2.75/3. She has about 2.5 hours of daytime naps. Bedtime routine is bottle, bath, book, bed

Do some babies just cry at bedtime no matter what? It’s very distressing to me to hear her cry. Initially when I started sleep training I thought the crying would be short term but it’s worrying me it’s continued on this long and I’m not sure what I’m doing wrong